It is currently Tue Mar 02, 2021 3:39 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 27 posts ]  Go to page 1, 2  Next
Author Message
PostPosted: Fri Dec 11, 2020 3:29 am 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
I am new to this forum and i have tried to search for my issue, i have not landed on a thread that can help me and hence i am asking this question here.

2000 Bonneville SSEi

138000 KMS - Canadian Car

I had the random miss at idle when in park and car would rock a little bit.
I decided to do the plugs, wires and fuel filter. I replaced with AC delco stuff which was OEM.

Sometimes i feel the car is rocking when i am driving, its almost like a hesitation or a lurching feeling. It happens at random speeds. It does not happen when its cold or driven for less than 20 mins. When it starts to happen and i let go off the gas pedal the car shakes momentarily. If i press the gas pedal and release it right away i get this rocking i feel coming from the engine.

Other times i can feel a shake coming from the rear when i hit speeds of 100km/h or above.

Another thing to note, when i shift into D from P, there's a definite movement and you can feel the tranny engage, its more pronounced in this car now than before.
Tranny was rebuilt at 90,000 KMS.

I am guessing its something to do with either my mounts and/or axles.

How can i go about diagnosing this.
Suspension is tight, tires are a year old. I will re balance them, but i have zero shimmy in the steering wheel when going over 100km/h, i just feel a shake under the seat and coming from the rear.
Also not sure if bad engine mounts and/or axles would cause lurching. No clicking noise or clunks etc.

Any help is much appreciated


Top
 Profile  
 
PostPosted: Fri Dec 11, 2020 11:11 am 
Offline
SSE Member
SSE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 128
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
It's funny, I've experienced most of the issues you have and despite throwing a considerable amount of time and money at the problems, one of them still persists.

For your random miss issue, I have two recommendations:

- Change the coil packs. (You could even get one and try different positions to troubleshoot instead of replacing all three)
- Change the small vacuum line that runs around the supercharger. (3800 Vacuum Harness)

If the problem persists after those relatively cheap repairs, then it may be the Ignition Control Module, but that's a more expensive part.

When you shift from D into P:

-Rear Transmission Mount

Relatively inexpensive and will likely help with that feeling. If you still feel significant movement, I'd recommend replacing the front mount. There's a inventive option over the stock ones that tend not to last very long, but it stiffens the ride a little. Ask harofreak00 about the "boat roller mount" if you're interested.

And finally the shaking:

-Good luck

Ha. But seriously I have been all over my car trying to solve my 110-120 km/h shake and it's still there. Wheel Bearings/Hubs, Ball Joints, Drive Shafts, New Wheels and Tires, New Inner and Outer Tie Rod Ends, New Rear Shocks (long shot, but had to try), New Passenger Side Engine Mount and Drivers Side Trans Mount, etc.

My mechanic's best guess was one of my new driveshafts wasn't properly balanced, but I just changed them and didn't want to tear it all apart to replace a new part.

One of the few things left on my list to try is my front shocks. We'll see about that in the summer. For now I'm just going to live with it.

The kicker is the cause of your shake might be completely different. It's common for this platform to have this problem, but the fix can be different from car to car.

If anyone else has any advice, feel free to chime in!

_________________
2003 Pontiac Bonneville SSEi (L67) - Galaxy Silver Metallic
1996 Chevrolet Camaro (L36) - Sebring Silver


Top
 Profile  
 
PostPosted: Fri Dec 11, 2020 11:39 am 
Offline
Posts like an LG3
Posts like an LG3
User avatar

Joined: Tue Oct 19, 2010 7:45 am
Posts: 322
Location: New York
Year and Trim: 2004 Bonneville SE
Some of the issues may not be suspension related, trying disconnecting the MAF sensor and see if things improve. It's OK to drive with it disconnected.
If the MAF is suspect try cleaning or replace with high quality (OEM) sensor.

_________________
2004 Bonneville SE 151,xxx- 20% tint all around, 5% tint bar on windshield | 4500k DDM HID low | De-badged | Hardwired Passport 9500ix | FWI(inter-cooler piping) | FE2 Rear Sway Bar | Solid Motor Mount | 180* Stat | Firm Shift Kit



- '92 Bonneville SE - '85 Grand Am - '73 Catalina - '67 Catalina
- '87 Bonneville SE - '82 6000 - '78 Catalina [/color]


Top
 Profile  
 
PostPosted: Fri Dec 11, 2020 4:08 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Thanks for the input.

I will disconnect the MAF and test
Will also replace the coil. I have ordered one and will swap it around to see.

The shake bothers me less, i need to figure this miss first.


Top
 Profile  
 
PostPosted: Thu Dec 24, 2020 3:03 am 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
I tested the coils; i bought one new and tried to switch it around. Nothing.
I decided that it was time for coils and ICM anyway and got Delphi coils and Delphi ICM. Replaced it and applied thermal paste. Still the same.
Still got that bucking when doing constant speed. Thought i may as well clean the MAF. Cleaned it with MAF cleaner and right after installing it engine started to stumble bad. I thought it was adjusting, so i let it be. Took it for a spin and i got the P0102: Circuit low input.

I thought i had a bad MAF; got a new one and put it in. Still the same stumbling and now more codes. P0131 and P0171. O2 sensor and Lean on bank 1. Car stumbles a lot with the MAF connected so drove it with it disconnected. Engine runs exactly like before when i had the old coils, ICM and the old MAF connected.

What should be my next to do item?

My theory is the old MAF was dead but never threw a code; and after cleaning and subsequently replacing it the other issues are surfacing up. I smoke tested it and no leaks.

Note: When i re did the leads; i did not put the plastic insulation from the old ones on it. Could the leads touching be an issue? Before i did the leads and plugs i had same issues.


Top
 Profile  
 
PostPosted: Thu Dec 24, 2020 10:51 am 
Offline
SSE Member
SSE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 128
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
Based on your codes, I'd figure out which O2 sensor that is and replace it.

I'd also run some fuel injector cleaner through the system, and as mentioned before change the 3800 vacuum harness just in case that's causing some of the issues. It solved some erratic idling on my car and the old line was extremely brittle and cracking when I removed it.

It sounds like your MAF may have been bad assuming the P0131 and P0171 codes didn't appear at all until AFTER you put the new one in. And if you cleared the codes after removing the old one and P0102 didn't re-appear then again yes I think you're on the right track assuming the old MAF was bad.

EDIT: ...And like you're deducing, now that you're using a MAF that works it is telling you your O2 sensor is out. Forgot to add that part.

Not sure about the leads.

_________________
2003 Pontiac Bonneville SSEi (L67) - Galaxy Silver Metallic
1996 Chevrolet Camaro (L36) - Sebring Silver


Top
 Profile  
 
PostPosted: Thu Dec 24, 2020 10:54 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
I will check the wiring to O2 sensor, making sure its not in touch with the leads.
Any tips on replacing the O2 sensor. Where are the connectors?

I will also order a new 3800 Vacuum Harness.

Thanks.

Namrepus28 wrote:
Based on your codes, I'd figure out which O2 sensor that is and replace it.

I'd also run some fuel injector cleaner through the system, and as mentioned before change the 3800 vacuum harness just in case that's causing some of the issues. It solved some erratic idling on my car and the old line was extremely brittle and cracking when I removed it.

It sounds like your MAF may have been bad assuming the P0131 and P0171 codes didn't appear at all until AFTER you put the new one in. And if you cleared the codes after removing the old one and P0102 didn't re-appear then again yes I think you're on the right track assuming the old MAF was bad.

EDIT: ...And like you're deducing, now that you're using a MAF that works it is telling you your O2 sensor is out. Forgot to add that part.

Not sure about the leads.


Top
 Profile  
 
PostPosted: Fri Dec 25, 2020 9:16 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Delete - Double Posted


Last edited by smokingfang on Sat Dec 26, 2020 2:27 pm, edited 1 time in total.

Top
 Profile  
 
PostPosted: Fri Dec 25, 2020 9:51 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Checked with Torque APP:
Both O2s are running 0.0V when MAF is connected.

With No MAF 0.8 and 0.9V

I redid the vacuum harness using plastic vacuum lines and some tees and other connectors i had. No vacuum leaks in the car, smoke tested.

Fuel pressure is 38-40 PSI.

So what is the recommended FP for these 3800 Series 2 SC?

Could it be low fuel pressure that causes the rough idle, misfires and the P0131 and P0171 codes when MAF is connected?


Top
 Profile  
 
PostPosted: Fri Dec 25, 2020 11:24 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1809
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
yes, check the o2 sensor near cylinder #4 on back of engine - mounted on exhaust manifold maybe it got damaged when you did plugs
you can clean the throttle body.

for the rear shake, balance tires first. inspect the tires
are the weights there?
is there a bulge, damage?

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


Top
 Profile  
 
PostPosted: Sat Dec 26, 2020 11:11 am 
Offline
SSE Member
SSE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 128
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
smokingfang wrote:
I will check the wiring to O2 sensor, making sure its not in touch with the leads.
Any tips on replacing the O2 sensor. Where are the connectors?

I will also order a new 3800 Vacuum Harness.

Thanks.



I haven't replaced the one on the back of the engine (I did the one down by the catalytic converter on mine to clear a code), but I'd recommend an O2 Sensor socket to do the job. It made things a lot easier, although it is possible to do the job without it.

The connector is just at the end of the leads coming out of the O2 sensor. Pretty straightforward, nothing to complicated when replacing these. The hardest part is usually getting the old one out.

_________________
2003 Pontiac Bonneville SSEi (L67) - Galaxy Silver Metallic
1996 Chevrolet Camaro (L36) - Sebring Silver


Top
 Profile  
 
PostPosted: Sun Dec 27, 2020 2:52 am 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
O2 sensor is hooked up correctly.
Any tips on the fuel pressure reading? I have 38 PSI when in the on position or start.

I feel this is low. Should i look at replacing regulator first or fuel pump?


Top
 Profile  
 
PostPosted: Mon Dec 28, 2020 3:20 am 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Update:

I checked MAF readings again with the new MAF. Turns out it was a similar looking MAF but not for the SC engine. I got the right MAF and no more codes.

Fuel pressure is still low IMO. I still have a slight hesitation under load at highway speeds.

I am reading 38PSI with vacuum connected and 42 PSI with vacuum off.

Anyone here know the spec for L67 SC engines fuel pressure?

My guess is the 50PSI is usually where it should be.

Will this mean a bad regulator or bad pump?


Top
 Profile  
 
PostPosted: Mon Dec 28, 2020 3:30 pm 
Offline
SSE Member
SSE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 128
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
I believe it should be closer to 50psi. There's a range, but I believe it starts in the high 40s, not the high 30s.

Could be either one. I imagine the regulator is easier to change out than the pump, but our cars do have a hatch to access it in the trunk. Or at least mine does.

I'd guess pump since you haven't mentioned anything about soot covered plugs, black smoke from the exhaust, or fuel leaking from the exhaust (which can go hand in hand with a busted regulator) but I'm only speculating.

Based on the age of the car, I'm not sure how much longer the pump will live on regardless. I know they were a common problem on the F-bodies with the N/A 3800 Series II.

_________________
2003 Pontiac Bonneville SSEi (L67) - Galaxy Silver Metallic
1996 Chevrolet Camaro (L36) - Sebring Silver


Top
 Profile  
 
PostPosted: Mon Dec 28, 2020 3:57 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1809
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
has the fuel filter been changed?
please remove the vacuum line from fuel pressure regulator - do you smell/ see gas in the line? if yes, change the regulator.

do you still have driveability issues?

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


Top
 Profile  
 
PostPosted: Mon Dec 28, 2020 5:19 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Fuel filter is new. no gas when i remove vacuum line. Driveability issue still there with highway speeds, very slight jerking.


Top
 Profile  
 
PostPosted: Thu Dec 31, 2020 3:32 am 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
Update:

Put in a new FPR, now i have 50PSI key on. 48PSI engine running and goes up to 52PSI when throttle is applied
So i am ruling out fuel issue.
New MAF
New Coils
New ICM
New Spark Plugs and Leads
All of this is genuine GM parts or AC Delco.

Idle is solid when in Drive(waiting on red lights etc)
Idle is good but i have some shake when in Park
On driving i feel there's a jerking when maintaining constant speed. Thing goes like a bat out of hell, but its not enjoyable with that jerking.

Vacuum leaks tested again. I have a leak(very very minor) at the tube that goes from manifold to egr i think. But not sure if this is the cause.

What can i look at next?


Top
 Profile  
 
PostPosted: Thu Dec 31, 2020 3:09 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1809
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
jerking at speed? is there a misfire? if you have scanner, check for misfire.

_________________
poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


Top
 Profile  
 
PostPosted: Thu Dec 31, 2020 3:52 pm 
Offline
SSE Member
SSE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 128
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
Hey, your fuel pressure fix is great news. I know it didn't solve the issue you're hunting, but it's nice to see a concrete result.

I very much doubt a small vacuum leak at the EGR would cause the issue you're describing while driving at speed. It would more likely result in a rough idle, which doesn't sound like a problem now, at least when you're in drive.

Not sure what the cause could be at this point. Best of luck though. You've already made huge improvements to the reliability of the car with the repairs you've done thus far.

_________________
2003 Pontiac Bonneville SSEi (L67) - Galaxy Silver Metallic
1996 Chevrolet Camaro (L36) - Sebring Silver


Top
 Profile  
 
PostPosted: Thu Dec 31, 2020 4:10 pm 
Offline
SE Member
SE Member

Joined: Thu Nov 19, 2020 4:41 pm
Posts: 15
Year and Trim: 2000 Pontiac Bonneville SSEi
96 SSEi wrote:
jerking at speed? is there a misfire? if you have scanner, check for misfire.

Its a very slight rocking feeling at speed.
no codes, scan tool does not show any misfires


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 27 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours [ DST ]


Related topics
 Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. 2000 SSEi power loss issues

Goostoff

9

1881

Thu Sep 17, 2015 8:23 pm

67goat View the latest post

There are no new unread posts for this topic. water and electrical issues with my 2000 SSEi

sportrider69

1

949

Thu Nov 29, 2012 12:21 am

harofreak00 View the latest post

There are no new unread posts for this topic. Strange Drivability Issue

J7319M

3

891

Tue Sep 03, 2019 11:47 am

Louiej99 View the latest post

There are no new unread posts for this topic. 2000 running issues

archaicguy

1

1011

Sun Aug 18, 2019 10:09 pm

nos4blood70 View the latest post

There are no new unread posts for this topic. 2000 SE, minor issues

MattStrike

1

904

Mon Aug 22, 2016 11:48 am

nos4blood70 View the latest post

 


Who is online

Users browsing this forum: No registered users and 10 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group


phpBB SEO