Misfire! Help!

[Canon Lansdell]

Also are you burning coolant? Or loosing any?

Coolant tank gets sucked dry and definitely loss of coolant but oil looks good and never smokes from the tailpipe

 

[Hipster]

Coolant tank gets sucked dry and definitely loss of coolant but oil looks good and never smokes from the tailpipe

And your worried about the fuel pressure being a few psi low. LOL

 

[stutaeng]

It misses at all speeds not just 95 lol

Oh dang! Then why you running it that fast if engine is missing?

I don't even know that my GMT400 can run 95MPH, with NO misses, LOL.

52 psi "IS" below spec BTW. Should be 60 psi minimum, but mine run fine at 58 psi. Any lower id say fuel delivery.

Does it hold 52 psi with key ON, but engine OFF?

 

[SUBURBAN5]

Coolant tank gets sucked dry and definitely loss of coolant but oil looks good and never smokes from the tailpipe

Get that fixed buddy. Especially if you take it to the drag strip. For giggles I would rent a compression test kit and test it.
Little fun story. Cyl 3 was getting some coolant in it. Drove fine until you accelerate or put it under a load. Then it would run like crap. Did a compression test and found cylinder 3 was low.

 

[SUBURBAN5]

Oh dang! Then why you running it that fast if engine is missing?

I don't even know that my GMT400 can run 95MPH, with NO misses, LOL.

52 psi "IS" below spec BTW. Should be 60 psi minimum, but mine run fine at 58 psi. Any lower id say fuel delivery.

Does it hold 52 psi with key ON, but engine OFF?

Oh shell hit 97 no prob if it's a vortec lol. Good ole suburban has 52/54 psi at idle and shell hit 98 no prob. Stopping on the other hand different story btw I dont recommend taking it to the limit lol. I rarely take her up to that. Just sometimes were cruising and when you look down boom 85. From there 90 comes up by "accident " 97 making sure the guage "works" lol .

 

[Canon Lansdell]

And your worried about the fuel pressure being a few psi low. LOL

Because it runs absolutely terrible. Sounds like a straight piped tractor sometimes

 

[Canon Lansdell]

Oh dang! Then why you running it that fast if engine is missing?

I don't even know that my GMT400 can run 95MPH, with NO misses, LOL.

52 psi "IS" below spec BTW. Should be 60 psi minimum, but mine run fine at 58 psi. Any lower id say fuel delivery.

Does it hold 52 psi with key ON, but engine OFF?

Just a little test to see how she was running. At that point in time the miss had gone away and that’s the only reason I did it. Yes holds 52 psi

 

[Canon Lansdell]

Took it to a local shop, they warrantied the distributor. There was moisture in the distributor, so they replaced the whole assembly and went ahead and did spark plugs. Picked it up, still had a miss (not nearly as bad), and this time a P0300 and P0340 code. Dropped it off at the shop again yesterday

 

[SUBURBAN5]

Hope there not using cheap parts

 

[Canon Lansdell]

Hope there not using cheap parts

Hope so too. Pretty well-used shop around town. They replaced the distributor the first time back in March or April.