The Saga continues...more issues - ZR-1 Net Registry Forums

Jalisurr · 01-24-2016

Hey folks,

So I recently discovered that, surprise surprise, the injectors on my car needed replacing. The guy I bought it from said they had been replaced with new Bosches, I guess those went bad too because I had two of them with ~6 Ohms.

So I pulled the plenum and installed all new Accel injectors, put it all back together and took it for a short test ride and it seemed great! Faster than ever and very smooth.

However, now, a week later I took it for a bit longer ride and it started running quite badly again. I was sitting in traffic for a little while at the start of the drive and then when I got to the highway on ramp and floored it it just stumbled and hesitated. Did a little more driving around then got scared and went home

it was stumbling right off idle and also if I gave it any more than about 5% throttle.

Got it back to my garage and popped the hood, it smelled and felt really hot in there, and then I could hear what sounded like bubbling coming from the throttle body I think. I didn't see the coolant gauge go above probably 220ish, but I don't know.

When I did the plenum pull I only drained a little coolant, just enough to get it below the throttle body.

Looking for more of your infinite wisdom, coolant issues? Something leaking? Is it overheating and that's why it's running poorly? Or do you suspect something else and I'm barking up the wrong tree?

lisounds · 01-24-2016

maybe a air pocket in the coolant???

XfireZ51 · 01-24-2016

Maybe fuel pump(s)

oricale · 01-27-2016

Any Codes?

The car may have gone into limp mode. Disconnect the battery for a few, check coolant, vacuum lines and try again. also check those injector wires.

Jalisurr · 01-27-2016

Nope, no codes. I'd love to see some codes, at least I'd know what was going on.

I'll try resetting the ECU, that's a good idea. And check all the injector wires.

W i l l · 01-27-2016

Check the resistance of the new Accel injectors...with the engine warm. Perhaps one of them stuck open.

Pete · 01-27-2016

If it does it when hot Ohm/check coils
How old are the wires.
Be very careful with coolant air pockets
You sure it was 220?
If ECM sees too high Temp
It will shut down secondaries.

Pete

HAWAIIZR-1 · 01-27-2016

Quote:

Originally Posted by lisounds

maybe a air pocket in the coolant???

I'm with lisounds and Pete suspecting an air pocket with the described sound. I would jack it up on the passenger side with the cap open to see if there is the gurgling and an air pocket release. If not confirmed about the actual temp like Pete mentioned.

Dynomite · 01-27-2016

When you fire it up cold the Injector Housing Coolant Manifolds should get warm within a minute. If not...the coolant is not circulating (Air Locked Water Pump). Prolly not relevant if your short and longer ride was more than a mile or so as by then you should be at least half way on the temperature or more. But.....also depends on what the Outside Air Temperature was in Vancouver.

Demps · 01-27-2016

Everyone's points are spot on. If it's none of these...

Another consideration, what plenum gaskets did you use?
1) is the plenum torqued to spec?
2) anything inhibiting proper mating?
3) depending on gasket, is the coolant passage hole in the front where it is supposed to be?
4) are there indications of coolant getting into cylinder? (Smell, plugs steam cleaned, visible coolant)

Ted

01-24-2016	#1
Jalisurr Join Date: Jul 2015 Location: Vancouver Posts: 22	The Saga continues...more issues Hey folks, So I recently discovered that, surprise surprise, the injectors on my car needed replacing. The guy I bought it from said they had been replaced with new Bosches, I guess those went bad too because I had two of them with ~6 Ohms. So I pulled the plenum and installed all new Accel injectors, put it all back together and took it for a short test ride and it seemed great! Faster than ever and very smooth. However, now, a week later I took it for a bit longer ride and it started running quite badly again. I was sitting in traffic for a little while at the start of the drive and then when I got to the highway on ramp and floored it it just stumbled and hesitated. Did a little more driving around then got scared and went home it was stumbling right off idle and also if I gave it any more than about 5% throttle. Got it back to my garage and popped the hood, it smelled and felt really hot in there, and then I could hear what sounded like bubbling coming from the throttle body I think. I didn't see the coolant gauge go above probably 220ish, but I don't know. When I did the plenum pull I only drained a little coolant, just enough to get it below the throttle body. Looking for more of your infinite wisdom, coolant issues? Something leaking? Is it overheating and that's why it's running poorly? Or do you suspect something else and I'm barking up the wrong tree?

01-24-2016	#2
lisounds Join Date: Jan 2011 Location: Long Island, New York 11542 Posts: 147	Re: The Saga continues...more issues maybe a air pocket in the coolant???

01-24-2016	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: The Saga continues...more issues Maybe fuel pump(s)

01-27-2016	#4
oricale Join Date: Oct 2011 Location: STAFFORD VA, Posts: 576	Re: The Saga continues...more issues Any Codes? The car may have gone into limp mode. Disconnect the battery for a few, check coolant, vacuum lines and try again. also check those injector wires.

01-27-2016	#5
Jalisurr Join Date: Jul 2015 Location: Vancouver Posts: 22	Re: The Saga continues...more issues Nope, no codes. I'd love to see some codes, at least I'd know what was going on. I'll try resetting the ECU, that's a good idea. And check all the injector wires.

01-27-2016	#6
W i l l Join Date: Jul 2005 Posts: 77	Re: The Saga continues...more issues Check the resistance of the new Accel injectors...with the engine warm. Perhaps one of them stuck open.

01-27-2016	#7
Pete Join Date: Dec 2003 Location: Chicagoland,IL Posts: 2,667	Re: The Saga continues...more issues If it does it when hot Ohm/check coils How old are the wires. Be very careful with coolant air pockets You sure it was 220? If ECM sees too high Temp It will shut down secondaries. Pete __________________ '91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage Last edited by Pete; 01-27-2016 at 10:03 PM.

01-27-2016	#9
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,816	Re: The Saga continues...more issues When you fire it up cold the Injector Housing Coolant Manifolds should get warm within a minute. If not...the coolant is not circulating (Air Locked Water Pump). Prolly not relevant if your short and longer ride was more than a mile or so as by then you should be at least half way on the temperature or more. But.....also depends on what the Outside Air Temperature was in Vancouver. __________________ Clickable links On Iphone Touchable Links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 01-27-2016 at 11:46 PM.

01-27-2016	#10
Demps Join Date: Jan 2006 Location: Niceville Posts: 1,001	Re: The Saga continues...more issues Everyone's points are spot on. If it's none of these... Another consideration, what plenum gaskets did you use? 1) is the plenum torqued to spec? 2) anything inhibiting proper mating? 3) depending on gasket, is the coolant passage hole in the front where it is supposed to be? 4) are there indications of coolant getting into cylinder? (Smell, plugs steam cleaned, visible coolant) Ted