So ive been fighting an intermittent misfire for ever...

jchammond · 05-20-2019, 02:49 AM

Quote:

Originally Posted by Ommateal

Would love to do the CJ return... super sketched out on doing all the weird mods to the basket my self lol like im good at handy stuff, but thats kinda out of my typical realm.

Anyways the stumble... So the issue is weird.

After a cold start id say about 50-70% of the time, i feel a loss of power When trying to WOT around 3000rpm, you can feel it rev slower maybe even stumble a bit. The other 50% of the time It may not do this it may seem OK sometimes.

The big stumble happens after any decent amount of drive time: 20mins or so and around 180-200 degrees on oil temp... if I park it, then try to restart it before it gets cooled off, it has massive boggin issues...burble...shudder....misfire... struggles to get to any amount of speed, almost stalls out.... THEN the more gas i give and and the more i keep driving it, it starts to clear up and becomes normal again back to the same behavior as cold start driving. At least until I park it again.

THe shitty thing is this can deff be AF sensors.. or Fuel...or who knows lol.

After u put the new sensors on it drove the best it has since the problem started.

But again that only lasted like 2 weeks.

Definitely sounds like low fuel pressure/ sounds like it’s an old carbureted car trying to vapor lock.
You can pick one of these up cheap & extend the line,so you can view while driving...just keep outside of vehicle.

Ommateal · 05-20-2019, 03:02 AM

Quote:

Originally Posted by jchammond

Definitely sounds like low fuel pressure/ sounds like it’s an old carbureted car trying to vapor lock.
You can pick one of these up cheap & extend the line,so you can view while driving...just keep outside of vehicle.

I have deff considered it being some kind of vapor lock when it is the hot start part of the issue... I have even heard of fuel rail vapor locks before on these IIRC.... But that seems odd and if any case you think it would be a rare issue...

Ill take a look at that part right now.

Vapor lock doesnt explain the colder engine issues...but bad fuel flow can. Either way its a Lean condition for sure ether thats from not enough fuel from the basket or a bad sensor not letting the ecu know whats up... so frustrating.

Ommateal · 05-20-2019, 03:06 AM

Quote:

Originally Posted by jchammond

Definitely sounds like low fuel pressure/ sounds like it’s an old carbureted car trying to vapor lock.
You can pick one of these up cheap & extend the line,so you can view while driving...just keep outside of vehicle.

I Deff might buy this right now just because its cool and handy regardless.

jchammond · 05-20-2019, 03:09 AM

Quote:

Originally Posted by Ommateal

I Deff might buy this right now just because its cool and handy regardless.

If you get on their website; they actually have videos of installation instructions...fairly simple.
Just mount gauge in a place that you can view while driving,,,just not inside your car.

jchammond · 05-20-2019, 03:29 AM

Quote:

Originally Posted by Ommateal

I Deff might buy this right now just because its cool and handy regardless.

If you phone & order this/ ask to speak with Jon P. (Their Tuner) & let him know your symptoms & what fuel pressure reading was at dealership.
He will be able to give you some helpful information on it

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