my 85 z28 lb9 a4 has been doing this since i bought it..

when its cold {after sitting all night} and i start it in the morning or whenever ,the check engine light comes on when it first starts,and it runs like total crap,misses,backfires,does all sorts of goofy shiat,but it will idle fine,part throttle or off idle throttle makes it go goofy,give it WOTand it runs great and pulls hard.

now heres the kicker,if i let it run for like a minute or two,and shut it off and restart it,the check engine light goes away,and the thing runs awesome,wont throw a code or run weird until it sits overnight and totally cools off again.

also,the damn temp gauge when first starting it cold,pegs out to the high mark{self check?} and it works fine,until i shut the car off again,then it quits working,and the self check thing goes to the 220 mark,once the car starts,it goes to the bottom


another thing im curious about...,the alternator went bad,and it had a 55 amp regular gm alternator in it. the car calls for a 108 amp unit,which my parts store was out of stock on,clostest they had was the 78 amp unit,which is in the car now,will this cause any problems?

 

Did you pull the trouble code?

 

Until you pull the code, nothing anyone can do for you.

Do a search or read the tech articles from teh main page to learn how to get the code.

 

heh,sorry you guys, i just pulled the codes and im getting a 32,33,34

another wierd thing happened last night,the car jsut DIED,restarts fine,then dies again right after. after a few attempts it started and ran like normal? did this a few times last night,then just stopped doing it. also,my power is leaving rapidly,as well as mpg

 

anyone?

 

Have you had any problems with the guage fuse blowing? And does your lockup convertor lock?

 

no,and no it doesnt apear to be locking up,but i doubt its locking up and stlaling the vehicle,it acts nothing like that,its like i shut the ignition off

 

My old TPI '85 Vette did the same thing.. new M.A.F. from GM was only thing that cured it. Went thru 4 others from AutoZone, Checker, Napa, etc.. before breaking down and throwing an extra couple hundred

 

The reason I asked the question is because I had a similiar problem and it turned out that when my tranny mount failed it cut the harness to the convertor and was blowing the guage fuse which also killed power to the maf and caused the same codes if I remember right.