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Old 07-10-07, 18:09   #1
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Hit boost and backfires and breaks down :(

hi guys

The car is a 4.2L Nissan Patrol.
About 2 weeks ago i gave my car some stick and just after redline it would start break down which is not normal as it could rev over it before hand anyway didn't think much of it after that then last week end i went to hit boost hard and it started breaking down badly and i was like hmm not good. So then today as the car doesn't get used thru out the week hit boost hard on way home to see what happens and just did a missfire/backfire and i got no idea what it could be ey and starting to pi$$ me off i was thinking coil or something..

Also if ur dizzy bolt to stop the dizzy turning is stripped and not very tight but doesn't seem to have moved be casuing this maybe??

Thanks alot for any help

Rick.
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Old 07-10-07, 19:20   #2
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if all your ignition components are in good nick, could be a lean missfire that is happening, should be evident by it having a flatspot before it missfires.

otherwise start with the basics, check plugs, leads, coils etc
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Old 07-10-07, 20:13   #3
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Quote:
Originally Posted by RB30-POWER
if all your ignition components are in good nick, could be a lean missfire that is happening, should be evident by it having a flatspot before it missfires.

otherwise start with the basics, check plugs, leads, coils etc
True i'll have to check everything over and see what i can come up with ..

The car runs Straight LPG with gas Research gear so i hope it hasn't gone lean because it would have to put back on the dyno and stuff..

Pretty much everything is new like coil and plugs and leads..

How can i check if the coil has sh1t it's self becuase i think a friend may have left the ign on and it could have fried it not sure ey..

I just need to know were to start looking as shops will bankrupt me these days LOL

Cheers

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Old 07-10-07, 21:24   #4
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yeah if yoru checks dont come out with anything put it back on the dyno..

Your problem actually sounds like a spark plug gap issue.. try gapping your sparkies to .8mm instead of the 1.0mm..

Mine did a simlar problem to yours and they eventually build up with crap and cant fire properly at higher revs.. once i gapped them correctly that sligh miss up in high revs dissapeared..
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Old 08-10-07, 06:58   #5
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Originally Posted by BADVLSL
yeah if yoru checks dont come out with anything put it back on the dyno..

Your problem actually sounds like a spark plug gap issue.. try gapping your sparkies to .8mm instead of the 1.0mm..

Mine did a simlar problem to yours and they eventually build up with crap and cant fire properly at higher revs.. once i gapped them correctly that sligh miss up in high revs dissapeared..
Cheers mate i'll be having a look at some stuff this arvo

I'll let you know how i go. I'm still not sure how to check if my coil is ok or not .

Rick.

I just hope it's something simple and not something big..

Well put a screwdriver in the no.1 lead and has blue spark which looked fine. That's all i checked as i had to go out

Took a quick vid to show the miss on idle that it neaver used to have.

http://www.youtube.com/watch?v=i07Qbwrk8KE

Thanks for ya help

Rick.

Last edited by MAV; 08-10-07 at 19:25. Reason: Automerged Doublepost
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Old 18-10-07, 21:24   #6
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Ok brought new plugs and gapped to .7mm and miss on idle and has coughs constant. When u hit boost it will just surge like it's going to go but then dies completey into nothing and by then i already had stopped accelerating.

What should i do??

Timming?

Then dyno'd the car so i got no idea what the timming should be?? Should i go back to standard timming and go from there??

Thanks alot for ya help

Rick.
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Old 18-10-07, 21:32   #7
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check the plugs on the crank transistor in front of the dizzy myn were loose inside the plug and caused it to miss and backfire
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Old 19-10-07, 06:42   #8
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check the plugs on the crank transistor in front of the dizzy myn were loose inside the plug and caused it to miss and backfire
Ok thanks mate!

Someone said last nite a friend said maybe it could be a lean missifire and lean surge when ya hit boost. But the odd thing is i thought Gas Research couldn't change as it has a metering rod and has to be lathed.

Thanks alot for ya help

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Old 19-10-07, 16:57   #9
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the mixer/throttlebody settings might be ok, but maybe the converter is stuffed/failed diaphram.

also need to look hard for any vac leaks or split hoses. (which may only open up under boost pressure)

Last edited by RB30-POWER; 15-02-08 at 16:59.
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Old 21-10-07, 17:29   #10
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the mixer/throttlebody settings might be ok, but maybe the converter is stuffed/failed diaphragm.

also need to look hard for any vac leaks or split hoses. (which may only open up under boost pressure)
oh ok thanks mate

Well i took the car to get looked at on friday and my dad had to take as i was working and they said that there was too much boost and just blowing the spark out. They turned the boost down which i was happy with untill i can upgrade the ign. They also put a set of spark plugs in that are cooler not so hot. So i was happy with it again to a degree as when it's idling it has a constant little miss and when u stab the throttle will die/cough/splutter which it neaver used to do when i first got it set up. After only a very small amount of driving all weekend it's bloody breaking down when loading up out of a corner and when u hold constant like 2800rpm rev in say 3rd doing 60km's will have a odd miss type thing then.
They tested my leads with a multimeter and one lead came back with nothing as they were going thru them and then they took it off and they it was fine again they said so not sure if it's stuffed and has like a loose connection or something.

I then said could it be running lean and he said that when it was dyno'd when they tunned it was running rich when it came onto boost. I then asked could it change or jump out of tune and he reckons not.

I think i might try another set of leads but i don't think that's the problem.

How can i test if my electronic ign black box thingo is working fine? It's just a small black box that's inside my distributor.


Thanks for any help guys !!

Rick.
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Old 21-10-07, 17:52   #11
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Got enough water flow through the LPG evaporator, need a fair amount of
flow to stop it icing up and if your water is also low then it might not get warm
enough to flowing reliably ?
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Old 21-10-07, 18:07   #12
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Got enough water flow through the LPG evaporator, need a fair amount of
flow to stop it icing up and if your water is also low then it might not get warm
enough to flowing reliably ?
Yea i might have a look at that i'm pretty sure the water level it pretty high.

The hard thing is i don't know if it's my engine or turbo or fuel issue or ign or what i just don't know were to go next..

Thanks for ya help mate.

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Old 21-10-07, 20:30   #13
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Given it happened after you gunned it, then fuelling might be an issue as you
might have stressed something in metering so it runs lean, quick check with
an AFR meter at a tuners would be a start, you might also have stripped a
tooth off any dizzy gear, gf did that with an HZ, over-revved it for a full
5 mins - no over rev cutout on that beast, fully stripped the drive gear
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Old 22-10-07, 17:04   #14
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Quote:
Originally Posted by Niche
Given it happened after you gunned it, then fuelling might be an issue as you
might have stressed something in metering so it runs lean, quick check with
an AFR meter at a tuners would be a start, you might also have stripped a
tooth off any dizzy gear, gf did that with an HZ, over-revved it for a full
5 mins - no over rev cutout on that beast, fully stripped the drive gear
Oh ok cheers mate i'm going to be taking it to someone on saturday if i can't find whats wrong with it earlier.
The guy i rang today and who i'll be taking it to said

Get a timming light and put it on ya coil lead or spark plug lead and when it misses on idle it should show up in the timming light if it's ign or elec fault.

This guy seems alot more switched on then the other people i been speaking too.

Thanks alot mate

Rick.
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Old 22-10-07, 17:18   #15
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dead set if the leads are in anyway suspect, get new ones.

lpg is so hard on ignition components its not funny.

testing with multimeter is not always a tell tale sign of their condition.

i have been caught out before and now learnt my lesson.

i keep a few sets of cheap generic type leads at work, even if they are not totally correct for the vehicle im testing, i make them fit with pliers or whatever for testing ignition system performance quickly and easily without forking out for vehicle specific leads when it may not be the problem.

sure i could get the scope out but thats farking around really.
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Old 22-10-07, 17:43   #16
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Originally Posted by RB30-POWER
dead set if the leads are in anyway suspect, get new ones.

lpg is so hard on ignition components its not funny.

testing with multimeter is not always a tell tale sign of their condition.

i have been caught out before and now learnt my lesson.

i keep a few sets of cheap generic type leads at work, even if they are not totally correct for the vehicle im testing, i make them fit with pliers or whatever for testing ignition system performance quickly and easily without forking out for vehicle specific leads when it may not be the problem.

sure i could get the scope out but thats farking around really.

Oh ok mate i might look at buying a set of leads then !..

Just can't wait to fix it for good haha
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