I've got a serious problem

[vilant]

Originally Posted by dredgeguy

I have had my 92 ZR1 for a few months and first thing I did was change the injectors to the FIC stainless steel, got new wires and coil packs from Jerry. One other thing, mine has 62,000 miles on it and when I changed the oil/filter also changed the fuel filter. Found out the fuel filter was original and stuffed with gunk.
Runs like a new car now thanks to the Wazoo gang

Was planning on injector, spark plugs and wires, and coil packs anyway. Just not so soon. Maybe I'll have a watch me tear apart my car and barbecue for those interested when I'm ready for it.

[vilant]

Originally Posted by scottfab

Joe
Boy after rereading you last post and how it started fine and ran for a bit... etc I got to say it sounds exactly like mine did as the primary fuel pump began to intermittently fail last year. It had run fine for many years then began to chug-a-lug sometimes. (ethanol related???)

It may have great fuel pressure upon start up then start petering out. Mine would start acting weird even before the engine was warmed. In retrospect I should have carried the fuel pressure gauge with me and slapped it on as soon and the symptoms came back. As a result of NOT doing that I ended up with a nice AAA sponsored flatbed ride

Now I have a secondary fuel pump bypass switch. It turns on FP2 so that if FP1 fails again I have a way home.

I'll definitly check the fuel pumps. Would be great to have a cheap fix and keep driving and enjoying my car until the injector change in Jan..

[vilant]

Well I grounded pin G on the ALDL and watched the display. Only code was C 12. Which means no codes. I guess that's a good thing. I'll start probing the fuel system next.

[Kevin]

test the injectors next. there's a way to do the primary's via the ecm but i don't know it. the other way is to pull the plenum and stick an ohm meter on them. 12.5-15 is what you need

[vilant]

Originally Posted by Kevin

test the injectors next. there's a way to do the primary's via the ecm but i don't know it. the other way is to pull the plenum and stick an ohm meter on them. 12.5-15 is what you need

I'll try the ECM, I'm sure it's in solutions, if not I have the FSM. Not pulling the plenum until I'm ready for the injector change.

[scottfab]

Originally Posted by vilant

I'll try the ECM, I'm sure it's in solutions, if not I have the FSM. Not pulling the plenum until I'm ready for the injector change.

I would think the next easiest is fuel pressure.
Someone recently put a gauge on with an extension long
enough to tape the gauge to the windshield. I would have
done that but didn't think of it. If it still starts and runs ok at
first then maybe you just watch that pressure to see if it starts
fluctuating or just goes low.

[vilant]

Originally Posted by Dynomite

Yep......-Solutions- post#4

Test Injectors

Lol, I was just reading that while you and Scott wrote your replies. Need to go buy a gauge and I'm going to buy a new fuel filter. I'm praying my fuel pump assembly doesn't look like the one in the post. That was one rusty SOB, lol.

[vilant]

Ok I just ohmed out the injectors, didn't feel like running out to buy a gauge yet. Did order a fuel filter though. Thank you c4koh for this http://www.zr1.net/forum/showthread....7299#post17299
made my job a lot easier. Here's the verdict
Primary Secondary
1- 11.8 12.4
2- 12.4 12.2
3- 3.6 7.4
4- 12.3 12.4
5- 7.1 2.7
6- 12.4 12.3
7- 12.6 12.3
8- 12.6 12.4
Think it's safe to say my #3 and #5, pri and sec are shot. The engine was cold, don't think that makes a difference in this case though. I'll still check the fuel system, but are those 4 injectors the root cause?

[Kevin]

well there's you're problem. they're all bad. 3 and 5 are dead, you need to replace all 16.

[vilant]

Originally Posted by Kevin

well there's you're problem. they're all bad. 3 and 5 are dead, you need to replace all 16.

I thought that if they were in the 12 range, they were still good. No? Or is that because the engine was cold.