Nissan Patrol 4.8 air flow meter

Submitted: Sunday, Jan 16, 2005 at 13:58
ThreadID: 19431 Views:3757 Replies:4 FollowUps:3
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Hi All,

I am trying to find information on a problem I am having with my nissan, I have a 4.8 nissan recently converted to lpg. Since the conversion I have experienced 2 backfires which may have damaged the air flow meter, making it undriveable on petrol. Would like any information if anyone has had a similar problem.

Thanks
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Reply By: Member - Maurice F (WA) - Sunday, Jan 16, 2005 at 17:08

Sunday, Jan 16, 2005 at 17:08
hi if your air flow meter is the hot wire type (which i suspect it is)then a backfire can and most times does blow the hot wire element away(it is like the filiment in a light globe fairly fragile as air passes over it, a signal is sent to ECG to increase or decrease fuel supply, i presume your car dosent respond to increased throttle depression dont think you can replace element check with after market reconditions of ECG units
Maurie
AnswerID: 93413

Follow Up By: annabi - Sunday, Jan 16, 2005 at 17:50

Sunday, Jan 16, 2005 at 17:50
cheers Maurie
Ill check that out
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Reply By: Member - Michael- Sunday, Jan 16, 2005 at 22:51

Sunday, Jan 16, 2005 at 22:51
Hi
The airflow meter is easy to replace, they cost about $300, but before I replace it find out the cause of backfires this shouldn't happen
May the fleas of a thousand afghan camels infect the crutch of your enemy and may their arms be too short to scratch.

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AnswerID: 93486

Follow Up By: annabi - Sunday, Jan 16, 2005 at 23:17

Sunday, Jan 16, 2005 at 23:17
thanks Michael
I think the lpg was running a bit rich
Geoff
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Reply By: Member - muzzgit - Sunday, Jan 16, 2005 at 22:51

Sunday, Jan 16, 2005 at 22:51
Hi there.

I had an FJ62 on gas which backfired a couple of times, I nearly burst my poopper valve the first time it happened, I was trying to cross a busy road, gave it a boot full and it went boom !

It turned out to be because the timing was out, HHMPFH (bloody mechanics) not that this will be a problem in your bus, but watch out that it hasn't burst the air filter box or air intake piping. When my cruiser backfired it almost ripped the top clean off the airfilter box !
Yes, that's right, the big Toyota one with the 4 clips on the side as well as the screw down top !!!!!!!
It was terry the roo shooter (roo ted) and I had to get a new one.

Cheers,

Muzz
AnswerID: 93487

Follow Up By: annabi - Sunday, Jan 16, 2005 at 23:23

Sunday, Jan 16, 2005 at 23:23
Thanks Muzzgit
yes unfortunatly it did blow the crap out of my airfilter box and also the crap out of me

cheers Geoff
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Reply By: Yeah Mate - Monday, Jan 17, 2005 at 02:46

Monday, Jan 17, 2005 at 02:46
Annabi,

As LPG is a dry fuel it doesn’t have a very good conductivity as petrol does; so a slower burn time. To compensate for this; advanced timing/or dual curve timing units, higher voltage/ and or multi spark ignition units can help out a lot. But, check out your vehicles ignition system first, HT leads for high resistance is first priority, cap & rotor cracks/or tracking marks, HT system voltage (coil/s output) and I think NGK do a special spark plug for LPG.
Happy hunting.
AnswerID: 93510

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