C5 Hardtop hesitation
Thread Starter
Racer
Joined: Dec 2003
Posts: 493
Likes: 235
From: hayward ca
C5 Hardtop hesitation
Hello to all
I usually spend time in C1/C2, my mostly stock, 105K+ miles, 2000 Hardtop is in relatively good condition. But 2 things have come up, I will concentrate on the drivability issue in this thread. It starts and idles fine. The issue is it has hesitation when strongly accelerating. And I believe I can feel hesitation/surging at cruise/highway speeds. My suspicion is a fuel issue, maybe a sticky injector(s). I do use cleaner quarterly and should mention the car is not driven as much as it used to. New injectors from Summit are about $600+.
The questions: can I clean them myself ? I was thinking of buying one new injector and replacing one at a time to see if I can find a problem injector, is this worth the effort ?
Would like to find a chassis dyno shop in the SF Bay Area that could run the car to experience the problem first hand.
C Ya, Joseph Rock
Frankenstein 59
I usually spend time in C1/C2, my mostly stock, 105K+ miles, 2000 Hardtop is in relatively good condition. But 2 things have come up, I will concentrate on the drivability issue in this thread. It starts and idles fine. The issue is it has hesitation when strongly accelerating. And I believe I can feel hesitation/surging at cruise/highway speeds. My suspicion is a fuel issue, maybe a sticky injector(s). I do use cleaner quarterly and should mention the car is not driven as much as it used to. New injectors from Summit are about $600+.
The questions: can I clean them myself ? I was thinking of buying one new injector and replacing one at a time to see if I can find a problem injector, is this worth the effort ?
Would like to find a chassis dyno shop in the SF Bay Area that could run the car to experience the problem first hand.
C Ya, Joseph Rock
Frankenstein 59
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,595
Likes: 4,055
From: Cape Coral, Florida
Hello to all
I usually spend time in C1/C2, my mostly stock, 105K+ miles, 2000 Hardtop is in relatively good condition. But 2 things have come up, I will concentrate on the drivability issue in this thread. It starts and idles fine. The issue is it has hesitation when strongly accelerating. And I believe I can feel hesitation/surging at cruise/highway speeds. My suspicion is a fuel issue, maybe a sticky injector(s). I do use cleaner quarterly and should mention the car is not driven as much as it used to. New injectors from Summit are about $600+.
The questions: can I clean them myself ? I was thinking of buying one new injector and replacing one at a time to see if I can find a problem injector, is this worth the effort ?
Would like to find a chassis dyno shop in the SF Bay Area that could run the car to experience the problem first hand.
C Ya, Joseph Rock
Frankenstein 59
I usually spend time in C1/C2, my mostly stock, 105K+ miles, 2000 Hardtop is in relatively good condition. But 2 things have come up, I will concentrate on the drivability issue in this thread. It starts and idles fine. The issue is it has hesitation when strongly accelerating. And I believe I can feel hesitation/surging at cruise/highway speeds. My suspicion is a fuel issue, maybe a sticky injector(s). I do use cleaner quarterly and should mention the car is not driven as much as it used to. New injectors from Summit are about $600+.
The questions: can I clean them myself ? I was thinking of buying one new injector and replacing one at a time to see if I can find a problem injector, is this worth the effort ?
Would like to find a chassis dyno shop in the SF Bay Area that could run the car to experience the problem first hand.
C Ya, Joseph Rock
Frankenstein 59
Well if you have a scanner and I don't know how advanced of a DIY'er you are but you can look at some scan data...MAF, it could be a fuel pump going bad...you'd have to check fuel pressure...if fuel pressure drops when you blip the throttle that could be it....with the fuel injectors I'd do an injector leakdown check...you'd need bi-directional scan tool for that to open each injector for a specified amount of time and see how much your fuel pressure drops...you could hook up a 12v tester to the injector control wire and see the injector pulse...I have a Power Probe 4 tester that tests fuel injectors this way...will tell me injector on time, inductive kick voltage, ECM ground and supply voltage...you have do do some diagnosing these days and not just be a parts changer...let me know what you find !!
If you want to improve your diagnostic tools there are 2 gentlemen on Youtube that are excellent....Paul from "Scanner Danner" and Matt from "Schrodingers Box...Paul is the "Jedi Master" of auto diagnostics !!
Last edited by C5 Diag; Apr 11, 2018 at 01:06 PM.
