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Car Forum / Pontiac / Pontiac Fiero / August 2005no idle
I recently replaced the motor of my 85 gt with a new crate 2.8. I finally got it back running, but now it wont idle. I replaced the tps as I was getting the code for it around 32 mph. The new motor runs great off idle and cruising speed. timing is @ 6 dbtdc (calls for 10 but lugs on comp strokes too bad to start) Thinking idle air control but it idled fine b4 when I disc tps. As far as I can tell all vac hoses and sensors are connected fine, no err codes from the comp. Tried reseting the ecm still no change. anyway to check the iac for proper operation, and any other hint would be a big help. I think I can see what's wrong already. You've not set the timing right. It'll crank easily at 10*, or even 20*! Either your balancer has slipped and you're getting the wrong reading for base timing, or someone didn't jumper the A/B pins while setting the timing. Those are my best two guesses. >I recently replaced the motor of my 85 gt with a new crate 2.8. I finally > got it back running, but now it wont idle. I replaced the tps as I was [quoted text clipped - 6 lines] > change. anyway to check the iac for proper operation, and any other hint > would be a big help. Will check it against tdc of #1 and get back to you But why only idle. It runs like a scalded cat above 2500 rpms > I think I can see what's wrong already. > [quoted text clipped - 14 lines] > > change. anyway to check the iac for proper operation, and any other hint > > would be a big help. Plenty of advance will do that! ;) When you don't go into diag mode before timing, you're typically adding 30-36* above whatever you've dialed in. So.... you could be sitting at 42* initial! > Will check it against tdc of #1 and get back to you But why only idle. It > runs like a scalded cat above 2500 rpms try EGR valve stuck open > Plenty of advance will do that! ;) > [quoted text clipped - 5 lines] >> Will check it against tdc of #1 and get back to you But why only idle. It >> runs like a scalded cat above 2500 rpms |
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