Hesitation
Thread Starter
Le Mans Master
Joined: Aug 2004
Posts: 5,141
Likes: 7
From: Metairie Louisiana
Hesitation
My car recently started to hesitate or bog down when pushing the throttle 1/2 to 3/4 of the way down. This only seems to happen when first started and the engine temp is below 150 degrees. Any ideas?
Thanks
Thanks
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
I looked in my 86 FSM and it says in this order for hesitation, sag, or stumble. Little different for 95
check fuel pressure (should be 42 to 47) or for LT1
air leaks between MAF and TB
Spark plugs and wires
Ignition timing
Alternator output
Injector balance
IMO
p.s. I had a nissan rice burner that fried a diode in the alternator when I pulled too hard on the throttle passing cars.
check fuel pressure (should be 42 to 47) or for LT1
air leaks between MAF and TB
Spark plugs and wires
Ignition timing
Alternator output
Injector balance
IMO
p.s. I had a nissan rice burner that fried a diode in the alternator when I pulled too hard on the throttle passing cars.
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Safety Car
Joined: Aug 2004
Posts: 4,908
Likes: 735
From: Southwest Kansas
2022 Corvette of the Year Finalist -- Unmodified
2021 C6 of the Year Winner - Unmodified
My 94 has the same problem. Once it warms up everything seems to be fine. I have changed the plugs, cleaned the MAF, changed fuel filter, but haven't checked the TPS. I guess I'll do that next.
Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
You will need a voltmeter. Key on, not running, the TPS will need to be connected to get volts. On my 86 (probably different for LT1), probe the black wire (ground), and dark blue wire (ecm signal) to get the volts, then loosen the two bolts holding it on. And again numbers could be different on your, someone here might correct me. The volts should read 0.54v at closed throttle and 4.00v at WOT. Adjust the TPS to these numbers and your good to go with the TPS.
Melting Slicks
Joined: Sep 2005
Posts: 2,568
Likes: 264
From: Near Charlotte NC
I replaced my Cap,Rotor,Coil,& Ig Control Module today,used all GM stuff from the great folks at Superior Chevrolet ( www.superchevyperformance.com).
NGK coppers lighted by Moroso 8mm Wires.
The old 85 has never run better.No hesitation and better feel from the SOTP dyno.
\db2
Carolina
NGK coppers lighted by Moroso 8mm Wires.
The old 85 has never run better.No hesitation and better feel from the SOTP dyno.
\db2
Carolina
