Idle problems - Page 3 - ZR-1 Net Registry Forums

10-19-2008

Quote:

Originally Posted by ernbuild

Yes Guys the injectors were out, however all new O rings when it went back together. By the way the engine was apart 18 months ago, and was running ok till a few weeks ago. Have monster headers fitted, and relocated the O2 sensors further away from the engine. Also no cats, and burns a little oil at start up. Will check O2 sensors as well, as read also if they have a build up of gunk can cause surging. Will keep you advised. Thanks again for all the info guys, cheers Ern.

You reuse the factory injectors or replace them with something else?

Your O2's are not the problem, as they do not come online until after the car is warm. You say you are experiencing this issue on start up as well.

ernbuild · 10-20-2008

Reused the original factory injectors, but replaced the O rings as I said, however the vette only has 20000miles on the clock. I didnt give much thought to replacing them. ??????

tomtom72 · 10-20-2008

Ern, yea with 2k on the clock you would not think about the injectors. If they are OEM then they are MultiTechs (ACDelco) and are common steel.

Also, if they were exposed to gas made with methanol, over time they will have service issues due to the methanol. Over here we have had methanol for yrs mixed in our gas. Since 93 at least and on cars made before the 93 mod yr the injectors were not able to handle exposure to methanol for any long periods of time without suffering: metal corrosion & coil failures from shorts. A scan might tell you it's the injectors as you can look at the fuel numbers real time & see what's going on.

As an aside, the OEM units in my 90 failed at about 10k miles, but the car came to me with 7400 miles on it. It sat alot before me, and as soon as I started driving it I got about 5 months down the road and the coils went out due to the methanol. The metal was none too great inside the nozzel either. Mine failed without warning, fine one minute and a miss the next as mine had coil failure.

Tom

10-20-2008	#22
ernbuild Join Date: Jun 2007 Location: australia Posts: 45	Re: Idle problems Reused the original factory injectors, but replaced the O rings as I said, however the vette only has 20000miles on the clock. I didnt give much thought to replacing them. ??????

10-20-2008	#23
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,637	Re: Idle problems Ern, yea with 2k on the clock you would not think about the injectors. If they are OEM then they are MultiTechs (ACDelco) and are common steel. Also, if they were exposed to gas made with methanol, over time they will have service issues due to the methanol. Over here we have had methanol for yrs mixed in our gas. Since 93 at least and on cars made before the 93 mod yr the injectors were not able to handle exposure to methanol for any long periods of time without suffering: metal corrosion & coil failures from shorts. A scan might tell you it's the injectors as you can look at the fuel numbers real time & see what's going on. As an aside, the OEM units in my 90 failed at about 10k miles, but the car came to me with 7400 miles on it. It sat alot before me, and as soon as I started driving it I got about 5 months down the road and the coils went out due to the methanol. The metal was none too great inside the nozzel either. Mine failed without warning, fine one minute and a miss the next as mine had coil failure. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member Last edited by tomtom72; 10-20-2008 at 07:42 AM.