testing the ALCL. poor cold start running - ZR-1 Net Registry Forums

Karl · 05-26-2014

Well my car still runs bad.

It worked fine for two trips. After changing the fuel pumps and strainers I assumed (yeah I know) all was good and did not check the fuel pressure.

Car started right up and no cold start issues. Went downtown and ran a few errands, sat in traffic, and had no problem passing on the expressway.

I let the car sit for a few hours and the symptoms came right back. Maybe they never went away.

New fuel pumps, strainers, and filters.

Here are 4 videos I made.

* Ignition on, no start.
* Ignition off after no start
* Start up
* Shut off

http://feed1.tinypic.com/rss.php?ua=...0gbgs0BA%3D%3D

I am lost. Only thing I can think off is the fuel pressure regulator or maybe the ECM due to this thread with the same similar start up issues.

http://www.zr1.net/forum/showthread....=fuel+pressure

I see no leaks anywhere and all the lines are nice and tight.

Thanks for the help.

XfireZ51 · 05-26-2014

MAP sensor hose? Pop off? Has oil?

Schrade · 05-26-2014

Alright - maybe let's do static pressure test, and leakdown time.

Plug in FP guage, turn on key to prime rails. If it's not @ 43+ PSI, turn the key off and on again.

If you don't get it then, GENTLY pinch the fuel return line, and prime the rails again (this will NOT yet rule out the FPR), but will tell a line leak, or leaking injector, or (not likely), a bad pump check valve.

Post back on that...

And cold starts and running like bats from Hades means NOTHING. (and do bats actually 'run'??? maybe they do, to V1, then roll flaps and go for V2?)

05-26-2014	#1
Karl Join Date: May 2013 Location: Chicago Posts: 982	Re: testing the ALCL. poor cold start running Well my car still runs bad. It worked fine for two trips. After changing the fuel pumps and strainers I assumed (yeah I know) all was good and did not check the fuel pressure. Car started right up and no cold start issues. Went downtown and ran a few errands, sat in traffic, and had no problem passing on the expressway. I let the car sit for a few hours and the symptoms came right back. Maybe they never went away. New fuel pumps, strainers, and filters. Here are 4 videos I made. * Ignition on, no start. * Ignition off after no start * Start up * Shut off http://feed1.tinypic.com/rss.php?ua=...0gbgs0BA%3D%3D I am lost. Only thing I can think off is the fuel pressure regulator or maybe the ECM due to this thread with the same similar start up issues. http://www.zr1.net/forum/showthread....=fuel+pressure I see no leaks anywhere and all the lines are nice and tight. Thanks for the help.

05-26-2014	#2
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: testing the ALCL. poor cold start running MAP sensor hose? Pop off? Has oil?

05-26-2014	#3
Schrade Join Date: Dec 2012 Location: NC Posts: 1,783	Re: testing the ALCL. poor cold start running Alright - maybe let's do static pressure test, and leakdown time. Plug in FP guage, turn on key to prime rails. If it's not @ 43+ PSI, turn the key off and on again. If you don't get it then, GENTLY pinch the fuel return line, and prime the rails again (this will NOT yet rule out the FPR), but will tell a line leak, or leaking injector, or (not likely), a bad pump check valve. Post back on that... And cold starts and running like bats from Hades means NOTHING. (and do bats actually 'run'??? maybe they do, to V1, then roll flaps and go for V2?) Last edited by Schrade; 05-26-2014 at 09:30 PM.