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PostPosted: Tue Jan 24, 2017 11:33 am 
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Joined: Mon Jan 28, 2013 10:57 am
Posts: 48
This situation is a bit complicated so I will give a bit of back ground.

2006 Subaru Tribeca (H6 3 litre) with BRC plug and drive fitted at 42000 miles. Currently at 128000.
Both cylinder heads removed 3 times due to:
1. valve seat recession combined with leaking head gasket (valve seat recut and valve clearances set)
2. re-do head gasket in close succession to 1. due to missed cylinder head crack
3. further leaking head gasket due to failed thermostat and over heating. I also re-set valve clearances on bank 1 inlet valves which were tight. Generally runs well since with no overheating or coolant loss.

Had to replace full exhaust 6 months ago and chose to replace both cats (with 'sport cats'). Have since had to replace one front O2 sensor (AFR) due to failure immediately after new cat (damaged in removal I supect). Prior to this, I was getting a p0171 code due to spikes in a defective o2 sensor. No codes since O2 sensor replacement.

Current problem: I have drivability issues. Mainly off-throttle running which is a little irregular. It also sometimes stutters on acceleration. MPG has worsened a little. I monitor ECU parameters using a wireless OBDII reader which connects to my phone. All parameters look fine except long term fuel trims which are persistently negative (around -10% on both sides). I've checked a few things but discovered today that whilst running on petrol, the trims revert to normal (near 0%). Makes me think that the LPG system is overfuelling.

I've lost faith with both of my local BRC installers (original installer fitted Flashlube pipework incorrectly which effectively rendered it useless perhaps leading to VSR , second one didn't know that faulty float switch in lube bottle disabled lube pump so unknowly ran without functioning Flashlube for weeks). Would prefer not to go back to either of them.

Suggestions?


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PostPosted: Wed Jan 25, 2017 6:41 am 
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Joined: Sun Jun 21, 2009 4:14 pm
Posts: 442
Yes take it the Simon at LPGC!
He's the only person I trust with my lpg.

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Nissan Skyline 350gt Lpg fitted by Lpgc.


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PostPosted: Wed Jan 25, 2017 1:42 pm 
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Joined: Mon Jan 28, 2013 10:57 am
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Yes I would love to but he's 250 miles away!


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PostPosted: Wed Jan 25, 2017 3:55 pm 
Installer

Joined: Wed Sep 29, 2010 5:01 pm
Posts: 2917
Location: Yorkshire
57jam89 wrote:
Yes take it the Simon at LPGC!
He's the only person I trust with my lpg.

Cheers Simon!
DJB1 wrote:
Yes I would love to but he's 250 miles away!

So only about half the distance some of my customers come ;-)

What are the trims when engine is under load just before the point at which it goes open loop, and how do they compare to trims on petrol?

Simon

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Full time LPG installer
Servicing / Diagnostics / Repairs to all systems / DIY conversion kits supplied with thorough tech support
Mid Yorkshire
2 miles A1, 8 miles M62,
http://www.Lpgc.co.uk
Twitter https://twitter.com/AutogasSimon
07816237240


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PostPosted: Thu Jan 26, 2017 2:06 pm 
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Joined: Sun Jun 21, 2009 4:14 pm
Posts: 442
DJB1 wrote:
Yes I would love to but he's 250 miles away!


He's 177 miles away from me!

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Nissan Skyline 350gt Lpg fitted by Lpgc.


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