'94 Z28 seemingly major issues.
#1
03-09-2010, 12:28 AM
'94 Z28 seemingly major issues.
i have this '94 z28 with the LT-1/auto and for the first year it ran great with no issues but just in the last few weeks its ben having a few problems and today it got really bad. The wierd thing is that it runs fine half of the time but the other half it gives me a bunch of crap.
1)very rough idle and it shakes and it stalls out.
2)when its idling rough and i try to revv it, it backfires and shakes.
3)this one just happened today for the first time. after multiple attempts to start it and getting the rough idle it was finally running somewhat smooth. i noticed while going through my work parking
lot that even though my foot was not touching the gas the car was pulling me along at about 15mph. then i turned onto the street and went to accelerate and when i got to high rpms they wouldnt drop, like the throttle was stuck, so i stopped in the middle of the road and put it in park and the car redlined like i was flooring it even though i wasnt touching the gas. so i turned the car off and after multiple attempts to start it was running VERY bad but it got me into a parking lot, and i tried starting it 3 times and it just kept revving up so i turned it off. then after 2 hours i started it and it seemed fine so i drove it home.
i really want to get this stuff sorted out so any information is helpful. thanks in advance.
P.S. i was told when i got the car that the engine is not original but was taken out of a '94 impala SS
1)very rough idle and it shakes and it stalls out.
2)when its idling rough and i try to revv it, it backfires and shakes.
3)this one just happened today for the first time. after multiple attempts to start it and getting the rough idle it was finally running somewhat smooth. i noticed while going through my work parking
lot that even though my foot was not touching the gas the car was pulling me along at about 15mph. then i turned onto the street and went to accelerate and when i got to high rpms they wouldnt drop, like the throttle was stuck, so i stopped in the middle of the road and put it in park and the car redlined like i was flooring it even though i wasnt touching the gas. so i turned the car off and after multiple attempts to start it was running VERY bad but it got me into a parking lot, and i tried starting it 3 times and it just kept revving up so i turned it off. then after 2 hours i started it and it seemed fine so i drove it home.i really want to get this stuff sorted out so any information is helpful. thanks in advance.
P.S. i was told when i got the car that the engine is not original but was taken out of a '94 impala SS
#2
03-09-2010, 08:18 AM
You may want to take a good look at the throttle linkage, making sure the throttle is fully closed when the engine is idling. Also check for air/vacuum leaks. With the engine running so poorly, the check engine light should be lit, so it would help a lot to pull the trouble codes. However; is sounds like the opti may be acting up, especially if it got wet.
#3
03-09-2010, 09:00 PM
You may want to take a good look at the throttle linkage, making sure the throttle is fully closed when the engine is idling. Also check for air/vacuum leaks. With the engine running so poorly, the check engine light should be lit, so it would help a lot to pull the trouble codes. However; is sounds like the opti may be acting up, especially if it got wet.
#5
03-15-2010, 12:09 AM
also, the guy i got the car from said the motor was not original but is an iron head Lt1 from a 94 impala SS, if i was going to buy a optispark for it, are they universal for the 93'-'94 Lt1's or should i buy one specifically advertised for a Impala SS????
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