Idle Vibration after header install
Thread Starter
Senior Member
Joined: Aug 1999
Posts: 618
Likes: 0
From: Central, NJ
Car: 1989 IROC-Z
Engine: 350 Vortech Supercharged ZZ4 TPI
Transmission: T56
Axle/Gears: 3.73
Idle Vibration after header install
When my car is in gear and I have my foot on the brake while at a deap stop my car vibrates pretty badly. IT seems like its lugging a little.
It has done this for awhile now but after I go my headers installed it is much worse.
Are the headers just causing it to vibrate more? Did the guy that installed my headers mess up my TV cable perhaps? What if I turned the fuel pressure up.... could it simply not have enough fuel pressure since I added full ram air, hypertech chip, and headers?
Any info and/or help is greatly appreciated.
------------------
1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech chip with 160stat, Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, throttle body coolant bypass, Spohn SFC's on order, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)
Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's
1989 Chevrolet Celebrity Eurosport
2.8 MPFI, no mods
225,000 miles and still ticking!
More info and pics on my webpage:http://go.to/iroc-z
AOL IMer: GPA 0point0
It has done this for awhile now but after I go my headers installed it is much worse.
Are the headers just causing it to vibrate more? Did the guy that installed my headers mess up my TV cable perhaps? What if I turned the fuel pressure up.... could it simply not have enough fuel pressure since I added full ram air, hypertech chip, and headers?
Any info and/or help is greatly appreciated.
------------------
1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech chip with 160stat, Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, throttle body coolant bypass, Spohn SFC's on order, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)
Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's
1989 Chevrolet Celebrity Eurosport
2.8 MPFI, no mods
225,000 miles and still ticking!
More info and pics on my webpage:http://go.to/iroc-z
AOL IMer: GPA 0point0
Senior Member
Joined: Dec 2000
Posts: 516
Likes: 0
From: Mission Viejo, CA
It could be either your cat got knocked around and something broke loose in it, if so time for a new cat. Second it could be the AIR tbe if it wasn't secured properly to the headers. Either will cause a real annoying rattle at idle.
Supreme Member
Joined: Jul 1999
Posts: 2,010
Likes: 0
From: Homestead, Fla
Check to make sure the y pipe isn't resting on the body anywhere. Loose connections in the exaust somewhere...maybe loose or missing bolts for the accesory support brackets.
Raising your fuel pressure a bit would probably be a good idea..but it won't fix this problem.
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"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports
Raising your fuel pressure a bit would probably be a good idea..but it won't fix this problem.
------------------
"American made baby. 100% American iron. The muscle among the masses. My hero. Yep, you can take your ergonomically designed, space age, computer controlled, 4 door, cup holding map lighted split double wishbone split fold down retractable cargo covered moon roof piece of transportation and keep it. For I have felt the thunder. And I know the difference!"
JSP Motorsports
ICON Motorsports
Thread Starter
Senior Member
Joined: Aug 1999
Posts: 618
Likes: 0
From: Central, NJ
Car: 1989 IROC-Z
Engine: 350 Vortech Supercharged ZZ4 TPI
Transmission: T56
Axle/Gears: 3.73
"I went to 0.055", and the car was sluggish at low RPM's, and the exhaust smelled horrible. I went back to 0.050" gap"
I got that out of a post in the general engine board about spark plug reccomendations.
This guy is saying that he changed his plug gap and the exhaust smelled worse and the car was sluggish at low RPM.
When I get my headers installed, I had new AC Delco (nonplatnum) spark plugs put in. They are the stock plugs for an 89 L98 from pep boys.
Well could the new spark plugs be the reason for the idle vibration, and the fact that I can smell the exhaust more as well???
------------------
1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech chip with 160stat, Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, throttle body coolant bypass, Spohn SFC's on order, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)
Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's
1989 Chevrolet Celebrity Eurosport
2.8 MPFI, no mods
225,000 miles and still ticking!
More info and pics on my webpage:http://go.to/iroc-z
AOL IMer: GPA 0point0
I got that out of a post in the general engine board about spark plug reccomendations.
This guy is saying that he changed his plug gap and the exhaust smelled worse and the car was sluggish at low RPM.
When I get my headers installed, I had new AC Delco (nonplatnum) spark plugs put in. They are the stock plugs for an 89 L98 from pep boys.
Well could the new spark plugs be the reason for the idle vibration, and the fact that I can smell the exhaust more as well???
------------------
1989 Chevrolet Camaro IROC-Z
L98 - 350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back, SLP 1 5/8 Coated Headers, 3.23 Posi rear, Hypertech chip with 160stat, Under-Drive pulleys, AFPR, K&N's, !Air Box w/ Ram Air, moddified MAF, throttle body coolant bypass, Spohn SFC's on order, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)
Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn strut tower brace and LCA's
1989 Chevrolet Celebrity Eurosport
2.8 MPFI, no mods
225,000 miles and still ticking!
More info and pics on my webpage:http://go.to/iroc-z
AOL IMer: GPA 0point0
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