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 Injectors Queston?

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Ridin-Rivi
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PostSubject: Injectors Queston?   Wed Nov 25, 2009 1:32 pm

Hello - I just replaced the plugs in my sisters 95 Riviera Non Supercharged. The car was have starting problem so that definitely fixed the the starting problem.

The car seems to idle fine but when I hit the gas the car rumbles and shakes. The only thing I think it could be is the injectors.

Questions,

How hard is it to replace the injectors?

Does anyone have a write up?

Anyone know what else this could be???
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AA
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PostSubject: Re: Injectors Queston?   Wed Nov 25, 2009 1:38 pm

Since injectors are more expensive, I'd replace the fuel filter first. How many miles are on the car?

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
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Mr.Riviera
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PostSubject: Re: Injectors Queston?   Wed Nov 25, 2009 1:53 pm

could be wires or a coil pack as well. are you certain all the wires are in the proper order? i know my car will seem to run fine at idle with a cylinder down, and will still run with 2 cylinders gone.
If the plugs were bad enough the car had problems atarting them it puts lots of stress on the coils to produce the spark. if they are oil chances are one of them is going bad.

Like Aaron said, injects are not cheap, and i have heard of many of them going bad.

Here is what i would do: make 100% certain all the plugs are wired to the proper coil. take the wire/plug off one at a time and see if it is sparking. make sure you are grounding the electrode to something (like exhaust manifold) or else the current will use you as the ground.

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1996 with 244k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs.
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AA
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PostSubject: Re: Injectors Queston?   Wed Nov 25, 2009 1:56 pm

Ridin-Rivi, do you know if the car had the rumbling and shaking problem before you did the plugs? If not, I agree with Mr.Riviera - it could be a crossed ignition wire.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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Rickw
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PostSubject: Re: Injectors Queston?   Wed Nov 25, 2009 4:53 pm

I agree with a possible crossed wire but also would like to point out that running a car with bad or worn out plugs can and will stress the ignition wires and cause them to fail. The core of the wire may pass current fine under low load situations but not pass current under a load (above idle)
This is common failure mode of wires when they have been trying to work overtime with bad plugs.
I would replace the wire set before i started paying a bunch of money on injectors.
if you still have the problem after replacing wires, then there are still other things that need to be inspected and tested before condemning injectors.
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Ryan from Ohio
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PostSubject: Re: Injectors Queston?   Wed Nov 25, 2009 10:14 pm

The car is easy enough to replace wires on. If you did the plugs chances are you need the wires. Make sure to use the electrolytic grease.

Also check the contacts on the coil packs. If they are rusted or corroded sand them clean.
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Ridin-Rivi
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PostSubject: Re: Injectors Queston?   Mon Dec 14, 2009 11:27 am

Update - Well I finally took the car to the shop and $800.00 later it runs pretty good. Here is what they did.

Fixed fuel line by engine - It was leaking leaving a gas smell in the car

Replaced Plug Wire - #1 was sparking like crazy

Valve Cover Gaskets

Oil Pan Gasket

Front Brake Job

Fixed Power seat not moving forward

Replaced Master Cylinder

Now its runnin like a top.
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deekster_caddy
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PostSubject: Re: Injectors Queston?   Mon Dec 14, 2009 11:29 am

Ridin-Rivi wrote:
Replaced Plug Wire - #1 was sparking like crazy

Glad to hear you got it taken care of! Enjoy!
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