Topic: Jeep WJ Major Misfire (Read 15542 times)

jay140285 · « **on:** October 13, 2012, 08:44:25 PM »

Evening all,

So this evening, I pop out to the local takeaway for some errrr Salad.

Anyway just as I pull up in turns over to LPG, turn Jeep off and go and get my errrr Salad.

Come outside, fire up Jeep and it splutters a bit but fires on petrol and switches over to LPG instantly.

Now as I pull away it splutters and its running really rough to the point where it can hardly keep going, I managed to get it home with constant stalling and I have fault codes 301/302/303 pending.

I know its misfire on 1 2 and 3,

Could it have flooded itself by starting on petrol but not using the petrol it fires on before changing over???

I cannot see how it could be plugs or coils as it just went all of a sudden.

Thoughts please, as you know.

RX8 - Totalled by lorry
XJ - Done a wee on the drive and need to see where from
WJ - The above problem.

scrw · « **Reply #1 on:** October 13, 2012, 08:58:05 PM »

does it run okay on petrol?

if yes its lpg side, if not its more than likely ignition. Switch around the coils first off

jay140285 · « **Reply #2 on:** October 13, 2012, 09:05:50 PM »

Shit on both mate.

scrw · « **Reply #3 on:** October 13, 2012, 09:10:19 PM »

switch coils about, check the wiring to them too, could be water ingress

jay140285 · « **Reply #4 on:** October 13, 2012, 09:11:35 PM »

Ok will try moving coils, it is strange that it was perfect one minute then not the next, not warning signs.

jay140285 · « **Reply #5 on:** October 13, 2012, 09:26:48 PM »

could the ECU have got a bit scrambled?

And not fueling correctly, it smells of petrol a lot.

Should I disconnect the battery over night, see if it re sets?

Panic mechanic! · « **Reply #6 on:** October 13, 2012, 09:31:57 PM »

that sounds like the emulators packed up.

jay140285 · « **Reply #7 on:** October 13, 2012, 09:33:01 PM »

WTF is an emulator?

Panic mechanic! · « **Reply #8 on:** October 13, 2012, 09:36:13 PM »

it controls the injectors and when the engine is running on gas it stops the injectors firing fuel into the cyclinder but still sends the signal to the ecu to tell it ,they are

jay140285 · « **Reply #9 on:** October 13, 2012, 09:37:38 PM »

So is it part of the LPG installation or factory install

Panic mechanic! · « **Reply #10 on:** October 13, 2012, 09:39:30 PM »

lpg install usually mounted on the bulkhead, if you pull the fuse to the lpg power circuit( by battery), see how it runs then

jay140285 · « **Reply #11 on:** October 13, 2012, 09:41:06 PM »

Do that and see if it runs ok on Petrol?

Panic mechanic! · « **Reply #12 on:** October 13, 2012, 09:51:09 PM »

jay140285 · « **Reply #13 on:** October 13, 2012, 09:52:31 PM »

ok mate, LPG is under warranty still so hope it is that.

Shaggy · « **Reply #14 on:** October 13, 2012, 09:53:56 PM »

Pull the lpg fuse & try it on petrol only, when I did Jedi's misfire I even ordered coil packs as I have done quite a few over the years & they do go all of a sudden, turned out to be just plugs, bloody suprised me but don't panic yet & expect the worst!

jay140285 · « **Reply #15 on:** October 13, 2012, 09:55:27 PM »

It had a misfire a couple of months ago and recalling Nicks issue I spoke to him and it was the plugs.

I will pull LPG fuse and go from there.

Shaggy · « **Reply #16 on:** October 13, 2012, 10:01:42 PM »

Did you put the right plugs in it & check the coil packs for signs of tracking? Is the water level ok? any excessive steam from the exhaust? I wouldn't be worried yet though, try the basics first.

jay140285 · « **Reply #17 on:** October 13, 2012, 10:04:59 PM »

Yes correct plugs were used, water level fine, no HG failure signs.

Just pulled LPG plug and no difference at all. Its really struggling to run and even start.

daggie · « **Reply #18 on:** October 14, 2012, 06:55:37 AM »

mine does this every now and then

, disconnecting the battery works for me

Bubba · « **Reply #19 on:** October 14, 2012, 07:24:22 AM »

check simple stuff first dont PANIC yet i dont think the end of the wold is booked til a week thursday

jay140285 · « **Reply #20 on:** October 14, 2012, 11:32:36 AM »

So Plugs out, and rather wet.
Leaving them to dry for the day, engine turned over and excess fuel removed.

Visit paid by Kev and Gaz to give some general abuse and point at the engine.
Will put it back together later and update.

daggie · « **Reply #21 on:** October 14, 2012, 11:50:43 AM »

oddly, mine started up with a missfire this morning

jay140285 · « **Reply #22 on:** October 14, 2012, 12:09:18 PM »

WJ's like to do things together.

When my TPS went 2 other members had same issues within a week.

jay140285 · « **Reply #23 on:** October 14, 2012, 08:29:45 PM »

Plugs dried out, excess fuel removed all back together and still the same really rough.

As in struggling to maintain running.

Also noticed it seems to have used a lot of oil over the last week.

jay140285 · « **Reply #24 on:** October 21, 2012, 09:29:58 PM »

Its the bloody Head Gasket!!!!!!

Author Topic: Jeep WJ Major Misfire (Read 15542 times)

jay140285

scrw

jay140285

scrw

jay140285

jay140285

Panic mechanic!

jay140285

Panic mechanic!

jay140285

Panic mechanic!

jay140285

Panic mechanic!

jay140285

Shaggy

jay140285

Shaggy

jay140285

jay140285

jay140285

jay140285

jay140285