It is currently Fri Oct 18, 2019 9:51 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: Fri Aug 02, 2019 9:57 pm 
Offline
LE Member

Joined: Thu Jun 07, 2018 1:17 am
Posts: 4
Year and Trim: 2000 Pontiac Bonneville SSEi
So I have A 2000 ssei with about 175000 miles and I've had some trouble with misfires lately. It all started randomly one day as I was driving I noticed it seemed to have a cylinder not firing. so I got home and saw that one of my coils was bad. no big deal got another one and it was fine for about a week then It started missing again. I checked the coils again and I had another coil not sending spark to a cylinder. out of frustration I bought the extra 2 coils and new plugs and wires(was overdue for them anyways), and an ICU. This did help the misfire but it still would miss under load(right about when the boost gauge hits positive boost) and completely lose all power until I let off. it seems like all cylinders are missing. also the misfire destroyed my cat so I bought a new cat but didn't install it yet because I heard the misfire can damage it, so I gutted the old one for the time being. I guess I need advice on where I should go from here, any input is appreciated!


Top
 Profile  
 
PostPosted: Sat Aug 03, 2019 11:48 am 
Offline
SLE Member
SLE Member
User avatar

Joined: Wed Dec 20, 2017 9:53 am
Posts: 73
Location: Ottawa, ON, Canada
Year and Trim: 2003 SSEi
I'd think about replacing the TPS (throttle position sensor), but read up on the symptoms of a bad one first and see if it fits what you're experiencing.

Also, clean your MAF (mass air flow) sensor with the appropriate cleaner while you're at it.

I'd also recommend running a fuel system cleaner with your next fill up to make sure your injectors are clean.

(Can you tell I might have been chasing a misfire as well recently? Lol. Mine wasn't as serious as yours though from the sounds of it.)

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


Top
 Profile  
 
PostPosted: Mon Aug 05, 2019 10:55 pm 
Offline
LE Member

Joined: Thu Jun 07, 2018 1:17 am
Posts: 4
Year and Trim: 2000 Pontiac Bonneville SSEi
Namrepus28 wrote:
I'd think about replacing the TPS (throttle position sensor), but read up on the symptoms of a bad one first and see if it fits what you're experiencing.

Also, clean your MAF (mass air flow) sensor with the appropriate cleaner while you're at it.

I'd also recommend running a fuel system cleaner with your next fill up to make sure your injectors are clean.

(Can you tell I might have been chasing a misfire as well recently? Lol. Mine wasn't as serious as yours though from the sounds of it.)


I forgot to mention that I picked up a bottle of Lucas injector cleaner when all the problems started and ran it through. I’m starting to think I have a vac leak somewhere, seems to have a slight mis at idle now, and the boost gauge is fluctuating from -10 to -5 at idle which I’m pretty sure isn’t normal. I haven’t driven it for 2 months but I’m pretty sure it didn’t do that before.


Top
 Profile  
 
PostPosted: Tue Aug 06, 2019 1:36 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1708
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
I would unplug the Maf and see if the miss changes.

do you have a scantool that pulls live fuel trim and other data?

if yes, post fuel trims at idle, 1500 and 2500 rpm.

also, what is the map reading with key on, engine off?:

_________________
poverty forces one to do unorthodox things

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


Top
 Profile  
 
PostPosted: Thu Aug 08, 2019 7:56 pm 
Offline
Posts like an L67
Posts like an L67

Joined: Mon Jun 13, 2011 4:21 am
Posts: 1358
Year and Trim: 2000 SSEI
if you have a way to scan it, it will tell you what cylinder the missfire is on and you can look closer at that cylinder. could have a bad injector or bad injector connection, vac leak, carbon build up, bad pushrod, bad rocker, many things... hard to say. what codes are you getting?

S

_________________
Shane "RedZMonte"
2004 Z16 Z06: Virgin
2000 SSEi: Kenwood DDX512, 3.25" MPS, ZZP DP, PLog, Puck Mount, NGK TR7's, DHP Tuned
1995 Monte Z34: T04e "60" turbo, 42.5# injectors, Borla Catback, OBDII swap, DHP Tuned, Much more...


Top
 Profile  
 
PostPosted: Fri Aug 09, 2019 2:51 pm 
Offline
Posts like a Northstar
Posts like a Northstar

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1708
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
check ebay and the such for a cheap one to start - you can get decent ones to work with an android based phone also: live data capability would be ideal but not crucial.

_________________
poverty forces one to do unorthodox things

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


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 5 hours [ DST ]


Related topics
 Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. P0303 misfire under load

NuttyBar

3

695

Fri Aug 09, 2019 4:06 pm

96 SSEi View the latest post

There are no new unread posts for this topic. misfire on 02 SSEi

mjtr21

8

2711

Thu Nov 25, 2010 4:31 pm

mjtr21 View the latest post

There are no new unread posts for this topic. 2002 Bonneville SSEI Misfire HELP

huskiedano

1

1735

Wed Feb 23, 2011 4:43 pm

Archon View the latest post

There are no new unread posts for this topic. Attachment(s) '01 SSEI misfire and irratic tach reading

Oldman

6

1848

Mon Feb 06, 2012 8:08 pm

Oldman View the latest post

There are no new unread posts for this topic. 00 Bonneville SSEI Cylinder 1 Misfire & Strange Noise

donn188

11

2602

Thu Nov 08, 2012 7:32 am

donn188 View the latest post

 


Who is online

Users browsing this forum: No registered users and 5 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