High Idle problem (where do I start??) - ZR-1 Net Registry Forums

-=Jeff=- · 04-23-2008

got my Z running last week, it was idling fine then..

Tonight I went to move it to the other stall in the garage for my windshield install.. It would start and idle at 3K

SO where do I start? I am guessing vacuum leak? all the visible vacumm lines seem to be connected fine.. thoughts?

04-23-2008

Could be injectors, gasket, rubber boot. Several options. Spray it down with some carb cleaner to track it down. Or block off the air horn and see where the sucking noise comes from.

-=Jeff=- · 04-23-2008

Quote:

Originally Posted by Jeffvette

Could be injectors, gasket, rubber boot. Several options. Spray it down with some carb cleaner to track it down. Or block off the air horn and see where the sucking noise comes from.

Injectors are new, so you mean they could be leaking at the IH?

I think the weird thing is it was running fine a few days ago and now not correct at all..

In fact I know the last time I started it, Sat night it Idled fine. I will try the binder trick later this week, it is late here and I will need to have it in the driveway since my wife complains about the smell of the car running int he garage with the *** end pointing out and the door open

04-23-2008

Quote:

Originally Posted by -=Jeff=-

Injectors are new, so you mean they could be leaking at the IH?

Injectors have a high and a low mount point at the top. You put it in the wrong one and the injector seal doesn't seal.

-=Jeff=- · 04-23-2008

I think I know what it is.. I took the Air duct off and looked at the blades..
the Primary is open more then it should be.. I checked my TPS voltage.. 0.82v

My lower bracket for the ECM (off the Brake Booster is broken) so the ECM was resting on the cruise control controller, which was cauing the TB Blade not to close all the way. I am going to make my own mount bracket for the ECM like I did on my 89 when I converted it, no way I am buying another of those cheap ECM pot metal bracket just so it can break. My Z will never be NCRS anyway so I am not too worried about it. I think if I tried it now it would idle just fine.. but will do it tomorrow as the kids are in bed

-=Jeff=- · 04-23-2008

Oh yeah, ECM moved and the TPS is at 0.52 and I could see the mechanism move and close..

now to fix the mount

Paul Workman · 04-24-2008

Quote:

Originally Posted by -=Jeff=-

Oh yeah, ECM moved and the TPS is at 0.52 and I could see the mechanism move and close..

now to fix the mount

Good job on the troubleshooting; nice catch on the TPS! =D>

P.

-=Jeff=- · 04-24-2008

Quote:

Originally Posted by Paul Workman

Good job on the troubleshooting; nice catch on the TPS! =D>

P.

Yeah I figured I would start with the simple (quiet) troubleshooting last night.

I have an Idea for a support bracket, but I need to see if it will work for me..

I might try it tonight, we will see how time is when I get home.

I am getting closer to driving it.. After tomorrow I will need to finish the weather stripping. I have the B pillar installed but not glued yet

XfireZ51 · 04-24-2008

I need to set the Min Air on mine. Its idling a bit high at 850 and 0 IAC.

04-23-2008	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,132	High Idle problem (where do I start??) got my Z running last week, it was idling fine then.. Tonight I went to move it to the other stall in the garage for my windshield install.. It would start and idle at 3K SO where do I start? I am guessing vacuum leak? all the visible vacumm lines seem to be connected fine.. thoughts? __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

04-23-2008	#2
Jeffvette Guest Posts: n/a	Re: High Idle problem (where do I start??) Could be injectors, gasket, rubber boot. Several options. Spray it down with some carb cleaner to track it down. Or block off the air horn and see where the sucking noise comes from.

04-23-2008	#5
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,132	Re: High Idle problem (where do I start??) I think I know what it is.. I took the Air duct off and looked at the blades.. the Primary is open more then it should be.. I checked my TPS voltage.. 0.82v My lower bracket for the ECM (off the Brake Booster is broken) so the ECM was resting on the cruise control controller, which was cauing the TB Blade not to close all the way. I am going to make my own mount bracket for the ECM like I did on my 89 when I converted it, no way I am buying another of those cheap ECM pot metal bracket just so it can break. My Z will never be NCRS anyway so I am not too worried about it. I think if I tried it now it would idle just fine.. but will do it tomorrow as the kids are in bed __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

04-23-2008	#6
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,132	Re: High Idle problem (where do I start??) Oh yeah, ECM moved and the TPS is at 0.52 and I could see the mechanism move and close.. now to fix the mount __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978

04-24-2008	#9
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,666	Re: High Idle problem (where do I start??) I need to set the Min Air on mine. Its idling a bit high at 850 and 0 IAC.