I'll check battery terminals and ground bus bars as you suggest! Looks like it will be a busy weekend.


How does the battery ground wire look? Specifically, the copper under the insulation at both connection points?

Also, is there any corrosion on the ground bus bars under the front door kick ...

Haven't thought of inspecting the wiring to the crank sensor. Will look into that.

I have a '94 with 244K miles on it. I've been struggling with diagnosing a random stalling issue over the past 18 months. Stall occurs on straight highways at 65 MPH as well as in town driving. Frequency of stalling is low. I can go a few weeks with no issue, then one day it may stall once, or ...

Hi All,

I need to replace the front passenger side ceiling grab handle in a '94 Bonneville. Anyone know where I can find one?

'94 Bonneville, 228 K miles.

Recently, I've had intermittent problems with a real poor idle on a cold start. I have to keep the RPM above 1000 to prevent a stall. Idle resumes normal working conditions once the engine has reached operating temp. No CEL.

I checked the ignition control module ...

I had a high idle problem on my '94 Bonneville. I cleaned the throttle body, idle air control and MAF sensor with MAF sensor cleaner fluid and changed out the upstream O2 sensor. Problem has been resolved.

SES light is not on.

1994 Bonneville SE

Several months ago the engine would surge upwards of 3000 RPM on startup and stay there. I pressed the accelerator several times to see if maybe it was stuck, but surge continued. Turned engine off, cleaned the throttle body with carb cleaner and seemed to fix the problem ...

ok, well, I guess this diagnostic is in order

https://troubleshootmyvehicle.com/gm/3.8L/how-to-test-a-no-start-condition-1

follow the steps and you can find the issue without swapping things.


Well, that website was most helpful! It helped me quickly eliminate any issues with the fuel pump. I ...

96 SSEi wrote:yes, dont throw anything at it except a paperclip............

https://www.gmforum.com/obd-i-troublesh ... st-306836/

This trick won't work because my '94 has an OBDII connector, not the 12 pin ALDL OBD connector.

OK, I replaced both the crankshaft and camshaft sensors. Engine will still not fire up. And I cannot pull any codes since this '94 seems to be the intermediate between OBDI and OBDII. It has an OBDII connector, but none of the auto stores can pull codes. I even took it to an official North Carolina ...

1994 Bonneville, 220K miles

Made my usual left hand turn onto the road on the way to work this AM and the engine stalled. Coasted to the curb and tried to restart. Starter turns engine but engine didn't fire at first. Check Engine light came on. I pulled the negative cable off the battery to ...

harofreak00 wrote:Worn clutches. Did you try some Lucas trans fix like I mentioned?

Well, hmm, I finally did add Lucas trans fix. And you know what? Transmission hasn't skipped a beat yet. Color me a Lucas fan from now on.

So I've changed the trans fluid and filter. Topped it off, and found no leaks.

Shift problem still exists: On initial startup when engine is cold, trans does not go into Reverse right away. Instead, I have to move the shift lever through all gears down to "1" and back up to reverse before it ...

1998 Bonneville. 219K miles.

Lately, transmission has been slow to engage first gear. Happens at initial start up and will continue after coming to a full stop, such as at a stop light. Problem goes away after about 5-10 minutes.

Fluid looks clean. No leaks, but topped it off with about 1.5 qts ...

1994 Bonneville

Had a small coolant leak around the water pump hose connections. Moved the wiring harness out of the way to gain access to the hose clamps for tightening. Forgot to move them back into place. Alternator cooling fan shredded the wires running down to the AC compressor and sensors on ...

Well, I decided to change the head gaskets. Good decision! I found out all the water jacket passages in the head gaskets were about 90% clogged. Hence my overheating issues. Valves in head cylinders looked like toast. So I decided to purchase rebuilt head cylinders for $250 each.

Hopefully will ...

1994 Bonneville, 3800.

Severe overheating issues. After replacing radiator,thermostat, UIM and LIM gaskets with no help in overheating, decided to pull the head cylinders to check gaskets. Lo and behold, 90% of the water ports in the head gaskets were completely clogged.

So now I'm wondering if I ...

How hot did it get when it overheated, and for how long?



Also, was the UIM replaced when you replaced the lower gaskets? Same for the throttle body gasket?



Have you tried bringing it up to temperature with the cap off until the thermostat opens so it's not building pressure? This is typically ...

A failed lower intake manifold gasket is more likely. It's not as common on pre-95 engines, but it can happen. Blown head gaskets are few and far between on any 3800.

So I replaced the lower intake manifold a few weeks ago since I clearly noticed coolant leaking up around the junction of the ...