ok, 2 years ago when i bought my car it had this wierd problem where, sometimes when i was decelerating to a stop, my engine would begin to sputter. the rpms would be around 1000 and then they would drop to like 500 then back up to 1200, down to 500, up to 1200 until i came to a complete stop. if i stopped quickly, sometimes it would stall. this happens 90% of the time with a warm engine. i replaced the ISC valve and cleaned inside the TB but it didn't go away. this problem went away like a year ago but now it's back and i can't figure out what the hell is wrong. i'm thinking fuel system now. can anybody help?????

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Dan
1990 3.1L RS
80 Series Flowmaster
It's fast(er than a 3 cyl metro)

 

Sounds liek your EGR is sticking open... Any codes?

-Reno

 

i thought about EGR but i'm not sure. no, no codes though. in 2 years i've never thrown a code. wierd, huh?? i should replace the EGR valve anyway. i'll ask the guys at work. thanks reno.

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Dan
1990 3.1L RS
80 Series Flowmaster
It's fast(er than a 3 cyl metro)

 

I used to have that problem when i would disconect my battery and the computer reset it took about 1000 miles to go away it hasent done it lately now but i have this stupid code 32

 

That's weird.. I was going to say "bad MAF!" but I noticed you have the 3.1.

The EGR can stick open and not throw a code. The only time the 32 will throw is when there's a vacuum leak somewhere in the loop between the EGR solenoid, EGR valve, and EGR diag switch.


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

ok, we got 2 votes for EGR. and TomP, it's pretty stupid how sensors go bad and don't throw codes.when my coolant temp. sensor went bad...no code. OBD is worthless.

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Dan
1990 3.1L RS
80 Series Flowmaster
It's fast(er than a 3 cyl metro)

 

Heh, yeah, I know... I love how a MAF sensor can be bad, but the computer doesn't know.

My mechanic once told me his diagnostic computer told him the car's MAF was fine, and he unbolted it as a wild guess. He said the circuit board was melted! Strange how the computer thought it was fine, eh?


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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!