Okay, so I have a 1984 Pontiac Fiero SE that has about 113,000 miles on it. Initially when I got it I never had the stalling issue, or it happened so rarely that it wasn't a problem (I got it at about 107,000 miles). So now I'm faced with this awful stalling issue and it really prevents me from using the poor thing. On a normal day in Florida it'll drive a few miles, but when it heats up it starts to stall at nearly every stop. Sometimes it'll stall during acceleration and before the engine cuts off it feels like it's suddenly running super lean. The stalling seems to occur when there's heat because on a rainy or cold day it'll take much longer before it begins to stall at all. Usually once the engine has reached about 160 F for a little. However even when it stalls I can usually wait 30 seconds and it starts back up (only to stall at next stop).
Ive changed fuel pump, fuel filter (a while ago), O2 sensor, map sensor, cleaned throttle body, fixed vacuum leaks to throttle body, and IAC valve.
I'm almost certain it's temperature related at this point. If anyone has any idea where to head next that'd be fantastic. Thanks!
Check the engine sensors. The best test is to read the ALDL. That will tell you what the sensors are reading. An incorrect sensor will whack the computer and cause issues. Also, I know that you replaced the fuel pump, but measuring the fuel pressure would be the best test. You can use a flashlight to see what the fuel injector pattern looks like, and verify a clean shower. (TBI same as 4cyl?) Spark plugs must be gapped and good quality. I had 0.045 gaps in instead of 0.060 and it ran like Shite. I would do that before making an order for a pile of parts.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
I still haven't checked my codes but I plan to give that a try today.
I changed my spark plugs and changed their gap. The fuel pump relay looked absolutely awful and there was one at a nearby store so I replaced that as well. After the new relay was installed it seemed like it was able to make it a lot farther before deciding to cut out.
I'm looking into getting a new ignition control module but I'm going to have to order it online. Any more ideas?
