Thoughts on backfire?

[Karl]

I don't want to turn this thread into battle of the fuel injector manufactures/retailers.

Bottom line is I am going with the Accell units. There are at least two well respected LT-5 tuners not saying the best things about them. One is mentioned in this thread.

I am holding the receipt from FIC, purchase date 06/07/2010 "delphi new 92 zr1 2nd day." I did not technically have a bad experience with anyone at FIC. I just have a product of theirs that I am not happy with.

This is not a job I want to do twice, let alone once.

Later!

[KILLSHOTS]

Originally Posted by Schrade

Will an exhaust leak cause backfire, when he's got a good burn in the cylinders?

If so, what burns? HC's? Will HC's light up SES?

Got SES there KS?

No sir, nothing out of the ordinary, other than the backfire. When I'm shifting somewhat slowly, it actually backfires when I depress the clutch during full-throttle acceleration runs. Marc says he's seen maybe 1 car in the past 15 years backfire at such high RPM.

2 changes occurred: the new exhaust and Marc reprogrammed the PROM to add fuel and disable the DFCO. I'm baffled and even Marc doesn't really have an answer.

Start watching the "ZR-1s FOR SALE" section, guys...

[GOLDCYLON]

Originally Posted by XfireZ51

I have had my Accel injectors since 08. Never a hiccup.

Same as my RC injectors since 07 never a hiccup

[secondchance]

Originally Posted by Karl

I suppose you are correct but I have never heard of a failing injector on a 1993 to 1995 LT-5.

Karl,

I have a 94 and my injectors went bad.

[Karl]

Originally Posted by secondchance

Karl,

I have a 94 and my injectors went bad.

When and what did you replace them with?

[Schrade]

Looks like an injector debate thread is in order.

OP probably isn't too concerned with that debate ATM.

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KS; you do static FP tests? Leakdown time?

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The fuse circuit overload is a concrete clue. Maybe start there, to that thread...

[KILLSHOTS]

Originally Posted by Schrade

Looks like an injector debate thread is in order.

OP probably isn't too concerned with that debate ATM.

==========================================
KS; you do static FP tests? Leakdown time?

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The fuse circuit overload is a concrete clue. Maybe start there, to that thread...

Thanks Schrade, you're spot-on there! Frankly, I'm amazed with the track these threads often take. Anybody remember the exercise in 3rd grade where the teacher whispers to the 1st kid a topic and each kid then whispers to the next his take on said topic? What comes out of the mouth of the 30th kid is a million miles from what the teacher originally said. Good example: go check out my 4.10 gear thread. I'm still sorry I posted that thing.

Nope, the tests you mention are Greek to me. I let Bill handle all that, as I really just want to drive and enjoy the car. The fuse deal isn't related, though; that started when I got the engine compartment wet on Tuesday.

[PhillipsLT5]

header bolts loose?, manufacture of header gasket?
You were not enjoying the no cat smell, maybe cats will eliminate back fire?

[KILLSHOTS]

Originally Posted by PhillipsLT5

header bolts loose?, manufacture of header gasket?
You were not enjoying the no cat smell, maybe cats will eliminate back fire?

Hey Phil, yeah no indication that it's an exhaust leak at this point. Adding fuel or cats would only mask the problem; there's something else that's causing it. Marc suggested injectors and I just talked to Bill and he did, too. But my point is that the injectors seemed fine a few weeks ago, there was no backfiring with my old straight-pipe exhaust system. This is very frustrating, to say the least.

[Pete]

Originally Posted by KILLSHOTS

Hey Phil, yeah no indication that it's an exhaust leak at this point. Adding fuel or cats would only mask the problem; there's something else that's causing it. Marc suggested injectors and I just talked to Bill and he did, too. But my point is that the injectors seemed fine a few weeks ago, there was no backfiring with my old straight-pipe exhaust system. This is very frustrating, to say the least.

Bingo you will mask the issue.
If all is good,meaning you don't have other issues, I'm with Marc about injectors.

Here's an idea buy/install Accel injectors if it fixes your issue then return the FIC's for a refund if it does not fix the issue I'm sure Karl will buy them from you, at a discounted price jk.
Let us know the outcome.

I like to do injectors once since it's so involved to change injectors in our Z's plus gaskets.

Myself and all the fast Z's here in FBI land run Accels for the past 5-10 years no issues and they all run like Bat out of H@ll

I don't see battle of posts just exchanging ideas.
Agree to Disagree
Pete