bad cyl 1 misfire

[gremlin02]

has anyone come across this

Click to read more...

 

[smug]

nope, never

 

[gremlin02]

you funny

 

[PANDA]

You bought GTP Mikes car?

That car might throw misfire codes because of the cam...

Id post more details.

 

[Turbocharged400sbc]

plug, wire, coil, icm, low compression, injector, inj wires

 

[skeezer]

you're gonna need to be a bit more descriptive about what your problem is if you're looking for help.

 

[Turbocharged400sbc]

did it happen suddenly? gradually got worse? idle only? high rpm only? high load? 4th gear low rpm high load?
needs more info fella

 

[gremlin02]

ok left for work fri and misfire got to work no codes on scanner so i put plugs in it swapped wires swapped fuel injectors and coils and changed fuel pressure reg still no fire on cyl 1

 

[gremlin02]

definately suddenly

 

[Turbocharged400sbc]

you beat on it? Kr?
could still be coil/inj wires
what are the misfire counts? any counts on other cylinders?

 

[MuffHugger]

I just want to say I never had this kind of problem with the car since I owned it.

Eric had explained to me what he had done. Compression test on cylinders 1 and 3 were 150+ PSI. Swapped injectors, swapped wires, swapped coils, replaced ICM, replaced plugs, replaced fuel filter, and replaced FPR. The problem happened suddenly (overnight) after he had driven the car from work. The next morning the car started the problem.

 

[10sec]

that is pretty perplexing...

 

[Turbocharged400sbc]

swapped wires/injectors from adjacent cylinders?

 

[MuffHugger]

swapped wires/injectors from adjacent cylinders?

With known good ones, but to no avail.

 

[Turbocharged400sbc]

use a noid light to veriy inj wires are ok

did the no1 plug look different from the rest?

 

[MuffHugger]

use a noid light to veriy inj wires are ok

did the no1 plug look different from the rest?

He used a test light on the connector for the injector and it was flashing.

 

[MuffHugger]

Also mentioned that fuel pressure would fluctuate 10psi while running.

 

[10sec]

So this doesn't make any sense, it's got fuel, spark, and compression, but it's not starting

EDIT: "firing" is what i meant

 

[10sec]

Cool avatar GTPMIKE

 

[MuffHugger]

Cool avatar GTPMIKE

You confuse the hell out of me whenever you post.

 

[10sec]

Twas the idea when i did it, but that's actually a really good picture of james. He looks less like he wants to chase around and beat up little kids, and more like a happy person. I'm sure that picture shows why...

 

[MuffHugger]

Twas the idea when i did it, but that's actually a really good picture of james. He looks less like he wants to chase around and beat up little kids, and more like a happy person. I'm sure that picture shows why...

Changed my avatar to less confuse me and others.


Back to the issue; fuel, spark, compression are all present, but the car is still misfiring. Could there be an issue with timing?

 

[10sec]

Doubt it, could be a busted valve spring.

 

[TommyGloves]

Doubt it, could be a busted valve spring.

That would be really noticeable and the car would barely be driveable.

 

[Turbocharged400sbc]

That would be really noticeable and the car would barely be driveable.

dep where the spring broke...if it broke at the top coil the valve would have very low seat pressure/sit just off the seat....if it was the intake valve it would cause a cycling in the man vacum, which would explain the FP variance (though an air filed FPgauge /fuel pulsation would cause the same "variance")
id suggest a dynamic leakdown test to determin ring/valve sealing that a comp test wouldnt show ya.

does it do this at idle and at speed?
what are the history misfire counts for all cylinders? does 4 also have misfire counts?
ground one hand and feel around the coil towers down near the coil bolt and see if you have voltage leakage
what about the old plugs was cyl 1 different from the rest?