L98 Hesitating
Thread Starter
Racer
Joined: Jun 2004
Posts: 313
Likes: 0
From: Macomb MI
L98 Hesitating
Would like some thoughts with 91 L98 Automatic. I am experiencing some hesitation under hard acceleration, and again between about 68 and 75 MPH.
Getting old sucks, I have some loss of fine motor skills in my left hand so I am going to have to take it to a shop for repairs, but I am looking for some ideas before I make that trip.
Thanks,
Jim
Getting old sucks, I have some loss of fine motor skills in my left hand so I am going to have to take it to a shop for repairs, but I am looking for some ideas before I make that trip.
Thanks,
Jim
Corvette Enthusiast
Joined: Oct 2007
Posts: 6,797
Likes: 2,719
From: So. Cal.
2025 C7 of the Year Finalist- Unmodified
2024 C7 of the Year Finalist - Unmodified
2023 C7 of the Year Finalist - Unmodified
L98
Jim.
I can relate to the getting old thing. Hard accelaration (WOT) your car goes to open Loop. I guess I would check fuel pressure, timing, MAF and spray the throttle body with F.I. cleaner while running at about 2,000 rpm.
Good luck!
Corvette Mike
I can relate to the getting old thing. Hard accelaration (WOT) your car goes to open Loop. I guess I would check fuel pressure, timing, MAF and spray the throttle body with F.I. cleaner while running at about 2,000 rpm.
Good luck!
Corvette Mike
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Jim: I certainly agree on the getting old as the ole stud ain't what he used to be 
As for your question, do the simple stuff before you go to see Mr. Goodwrench! Here are some simple things to do:
1. Make sure you have a clean air filter.
2. How old are your spark plugs and wires? Do they need repalcement?
3. Check timing of engine and remember to remove (or open) the timing connection.
4. Check fuel pressure.
5. Your car came stock with GM Multec injectors and these have a high failure rate. Check the resistance of each injector when the engine is cold. Spec is 16.5 +/- .3 ohms. You should not find high readings on stock injectors. However, you may find lower readings. Low readings indicate shorts in the injector coil assembly. Also, check the resistance when the engine is hot. The coil resistance is related to temp and the readings should go UP when heated.
6. See if you can find someone to scan your engine for you. You may have sensor problems and these are difficult to locate without a scan tool.
Mr. Goodwrench will smile when he sees you coming with a Corvette
Good luck on the car,
Bob
As for your question, do the simple stuff before you go to see Mr. Goodwrench! Here are some simple things to do:1. Make sure you have a clean air filter.
2. How old are your spark plugs and wires? Do they need repalcement?
3. Check timing of engine and remember to remove (or open) the timing connection.
4. Check fuel pressure.
5. Your car came stock with GM Multec injectors and these have a high failure rate. Check the resistance of each injector when the engine is cold. Spec is 16.5 +/- .3 ohms. You should not find high readings on stock injectors. However, you may find lower readings. Low readings indicate shorts in the injector coil assembly. Also, check the resistance when the engine is hot. The coil resistance is related to temp and the readings should go UP when heated.
6. See if you can find someone to scan your engine for you. You may have sensor problems and these are difficult to locate without a scan tool.
Mr. Goodwrench will smile when he sees you coming with a Corvette
Good luck on the car,
Bob
