I have having trouble with my car starting up roughly since I've bought it. To this point I have replaced the battery, alternator, starter, EGR valve, PCV valve, Oil pressure switch, and more.. and this is just since June.
Anyway, sometimes the car will start up beautifully. Others, it will fire for 5-10 seconds and then finally turn over. Sometimes, it will fire for longer and not turn over. After the starter was replaced it worked great for about a week, then it went back to doing the same thing. When it'* firing and not starting, the RPM gauge reads ~500. Before the starter was replaced, it would fire but read 0 RPMs and wouldn't always start. If I get any RPMs to show then it would start up.
I should also mention that I am in the process of replacing my lower and upper intake manifold gaskets. The whole car was a big oily / coolant mess, so a lot of the parts may have been saturated and some connections may once again be as perfectly clean as when they installed them, but I'm going to clean it up really well after I get the new gaskets in.
Anyway, sometimes when the car starts up I get a SES light. If I drive it with the light on. It runs very rough. Hesitations when accelerating, sometimes even steam from under the engine. The light only comes on about 1/10 times I start the car. If I turn the car off and back on, it has gone away every single time. I had the codes read and here is what I got:
361 EST line not toggling
321 no 18X ignition pulse
I'm going to try cleaning the ignition module with a wire brush, other than that, would these be causing the above symptoms? What else should I be looking at? A donut exhaust gasket is also on order.
I found this forum that I found interesting and seemed to describe my problem incredibly well.. but I don't have all of the codes they mentioned. Thoughts are appreciated. Thanks.
check engine light on 95 bonneville - Automotive Message Forums