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4x4 cars and trucks
 
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I have a 88 chevy 350 TBI that ildes too high, i put a edelbrock performer intake on and set the timing to zero but it idles at 1400 rpm, which it turn makes it hard to start. i tried at 4 ATDC but it only lowered it to 1200 rmp and it ran bad. help?

By jfvilla Asked Jul 10 2008 4:54PM
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Answer 1 out of 3

by rustle on Jul 10, 2008 at 7:48 pm Permalink

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if it did not idle high before there must be an intake
leak at the head/manifold gasket
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Answer 2 out of 3

by Moosemose on Jul 10, 2008 at 5:44 pm Permalink

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U will have to Re-Set the Timing (follow the Basic Timing Procedures) back (to I think it's 4 BTDC?) then check to see that "Throttle Plate" actually "Closes" fully when adjusted out fully. Now start & see how far the "Throttle Plate" "Opens" & how fast it is running there. If there is no "Sticking" & speed is still not right, spray some WD-40 around looking for "Leaks" causing the high Idle. I'm not sure changing the EPROM will have an effect on this unless it's just plain BAD as I've never seen published "Idle Specs." for this. But I sure could be wrong. I do know that U definantly have to follow a SPECIFIC procedure for setting the "Basic Timing" & it's different from car to car. Good Luck. John
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Answer 3 out of 3

by hartdaniel on Jul 10, 2008 at 4:58 pm Permalink

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You will likely need to change the EPROMM to a performance module.
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I have a 88 chevy 350 TBI that ildes too high, i put a edelbrock performer intake on and set the timing to zero but it idles at 1400 rpm, which it turn makes it hard to start. i tried at 4 ATDC but it only lowered it to 1200 rmp and it ran bad. help?

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