ZR-1 specialist UK

[bigben]

Hello,

I have a 1990 C4 ZR1 which I am about at the end of my tether with. The story so far:

- Car would run like a bag of spanners once the engine was warm - traced this to injectors being low impedance, they were probably the originals so damaged by Ethanol
- Replaced injectors - car then ran badly at idle even when cold - found I had 'pinched' an injector wire so one of them was stuck 'ON' - fixed this no change
- Went through vacuum system tightening stuff up / replacing rubber bits - no improvement

Question is can anyone recommend a UK garage, ideally midlands based with ZR-1 experience. The above short list is in no way a reflection of the many many hours I have put into tracing the problem and I am bored of it now!

Thanks for any leads

Ben

 

[scazman]

Hi Ben.
I'm sure members will be along with other ideas, but I'd be surprised if Topcats Racing couldn't fix your issues. They're based in Bucks - so not a million miles from the Midlands. They definitely look after quite a few Vettes. Not personally used them (I'm based further south and am a very satisfied Ian Goss customer - IGS American, who would definitely be able to help, but he's London based).
Best of luck with it.
Have a look here - Servicing – Topcats Racing

 

[teamzr1]

Hello,

I have a 1990 C4 ZR1 which I am about at the end of my tether with. The story so far:

- Car would run like a bag of spanners once the engine was warm - traced this to injectors being low impedance, they were probably the originals so damaged by Ethanol
- Replaced injectors - car then ran badly at idle even when cold - found I had 'pinched' an injector wire so one of them was stuck 'ON' - fixed this no change
- Went through vacuum system tightening stuff up / replacing rubber bits - no improvement

Question is can anyone recommend a UK garage, ideally midlands based with ZR-1 experience. The above short list is in no way a reflection of the many many hours I have put into tracing the problem and I am bored of it now!

Thanks for any leads

Ben

Did you replace just the 8 primary or all 16 injectors ?
The ones you bought are they GM OEM or 3rd party ones ?
Did you check the vacuum hoses under the intake manifold for the secondaries ?

Is the fuel rail pressure like 43 PSI ?
Would help if you use a smoker and looked for slight leaks
Run any different if you have the power key on or off ?
Do you have an OBD1 scanner to see how the fuel trims, timing, ECT, MAT, etc. look like ?

I do custom tuning of GM vehicles, looking at the ECM stock calibration it is expecting
the injectors to be 22.8 lbs/hr flow ( with fuel rail pressure 43 PSI) so if the ones you installed are different either have to tune the calibration for them or buy the correct flowing ones.
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[EddyEdden]

Williams Bros, Brook Farm, Corn Hill, Bugbrooke, Northampton, NN12 8LQ might be worth a try. 01327 220777. They have worked on several club (and non club) members cars. Always eager to help.