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? __________________ 1990 ZR-1 #942, Black/black 1997 Mitsubishi Pajero Evolution #2023/2500 2004 Honda VFR800A

01-24-2016	#2
lisounds Join Date: Jan 2011 Location: Long Island, New York 11542 Posts: 143	Re: The Saga continues...more issues maybe a air pocket in the coolant??? __________________ 1995 ZR-1 Red / BLACK NCRS NATIONAL WINNER DAVE HILL AWARD TOP FLIGHT & PV AWARDS Currently in my Stable: 1978 PACE CAR L-82 4SPD "Triple Crown Winner" 1979 TRANS AM Bandit Edition 400 4 spd WS6 Y84 W72 1981 PORSCHE 930 TURBO 1995 ZR1 Red / Black 2004 Z06 Yellow / Black 2010 C6 Grand Sport Convertible Red/Black

01-24-2016	#3
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,666	Re: The Saga continues...more issues Maybe fuel pump(s) __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

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. __________________ [B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. Victory Loves Preparation

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. __________________ 1990 ZR-1 #942, Black/black 1997 Mitsubishi Pajero Evolution #2023/2500 2004 Honda VFR800A

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: 2,680	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: 3,788	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. __________________ Left Clickable 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: 997	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