I have a 93 Chevy Lumina, 3.1 liter engine. When I come to a stop, I will
smell a rich, sharp odor (not gas) and the car will die. In addition, when
I'm driving the car hesitates and I have to press harder on the gas to get
it to go. The problem doesn't seem to be heat related. I have made no
attempt at repair yet... I wanted to get the opinion of you fine folks
Some possible scenarios here:
1) filthy air filter is causing the engine to starve of air and the fuel/air ratio to become overly rich, causing excessive exhaust fumes
2) Fouled injectors causing a lean mixture, causing the car to run too hot and burning up the catalytic converter, causing excessive exhaust fumes
3) Plugged PCV valve, allowing excessive fuel vapors to accumulate in the crankcase, increasing the pressure inside the crankcase. Eventually this will force oil out of the PCV valve, down the PCV hose, and into the air intake. This oil could either run onto the air filter (fouling it), or be drawn into the engine and burned, causing excessive exhaust fumes
4) Faulty emissions control equipment can cause those symptoms, especially the EGR valve
5) A cracked engine block will allow coolant into the combustion chambers and oil sump, causing it to be burned.
I would check the PCV valve and air filter first, as these are inexpensive and easy repairs that often cause problems.
Sounds like a plugged up exhaust. If the smell is like rotten eggs, then your cat converter is plugged. Check to see if the cat is hotter than the rest of the exhaust with a temp guage, or just take it to a muffler shop and have them check it for you.
Thanks a bunch for the suggestions. I will check these things and get back
with you guys! You're a great help!!
Well, it seems that the problem is probably the ignition control module. I
went to a car repair place and they plugged it up to the diagonostic
machine and it simply said "insufficient spark". They delved into the
problem and deduced it was either the ignition control module and a coil
that needed replaced or it was the ECM. We replaced the plugs and plug
wires over the weekend to see if that might help (tough job), but
unfortunately it did not.
So now, we are looking to replace the ignition control module. I would dearly love to save a buncha cash by installing it ourselves if at all possible. Does anyone have any info to share regarding replacing this module? We think we have located it, but are a bit clueless on how to actually get to it.
Thanks in advance for your help.
I am having the same problem with my 92 buick regal. I replaced the plugs and wires but still it hesitates. any help would be appreciated.