How do you reset the fuel trims

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Willos

Active Member
Posts
521
Location
Huntingdon Cambs
What a week I've had with the rangie (4.0 thor V8). Had a big nocking from the engine. Turned out to be a hydraulic tappet. 3mm shorter from when it was installed and a big dish in the middle of it. Had to dermal the edge off to get it out of the block.
Had a load of old tappets , so picked out the best and replaced. Now its great but the fuel is all over the place. Had a few problems with packing styrene which was in the same box as my pipe that goes from the throttle to the air box. Yes sucked in a few of those and one got stuck in the idle valve. Yes could have spit blood over that daft mistake.
Ive ordered new lambdas and want to reset fuel levels.
Can you do this by disconnecting the battery or does it need to be done on a reset tool. Ive got a basic code reader and fault reset tool but that's as far as that goes.
 
Seems you have worked out most of it. Take it you took all the tappets out - what were the camshaft lobes like?? you may have a problem in the near future with a worn lobe on a part worn hydraulic tappet but with luck it could be OK. I would suspect that the camshaft is worn and the engine isn't breathing right so if an adaptive reset with a diagnostic tool i.e TestBook (after your new lamdas are in might reveal all!!! maybee.
Disconnecting the battery will achieve nothing.
 
New cam and tappets 6 months ago. The cam lobe wasn't that bad but had taken the peak off it. As its not a vital vehicle I can wait and see if the next tappet comes out the same. Another new cam if that's the case.
Can a snap on diagnostic tool do the same on the fuel reset
 
6 months and a tappet that bad, wow. If the lobe has the peek off it its as good as dead.
You may have a lube problem, did you use plenty of cam lube on start up? or bad tappet Or it was a bad cam, or the pre-load was out, or rocker problem ? Did you change the timing chain and sprockets?
Snap on ? Don't think so.
 
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There is a cam breakin procedure on 3.5 v8 and should be same on later engines and also although hydraulic the tappet clearance should be checked and shimmed if needs be
 
Well all the other tappets are ok. Maybe cam or tappet Its only on that one. Not lube problem as new oil pump and sprockets and chain. If it starts again I will strip it and start again. I have a o2 sensor problem now so started a new thread.
 
Britpart give a 24 Month guarantee. Give their Sales Dept. a call-they are very helpful.

Lot of knocking on here about Britpart but I have always been satisfied with them.

Found genuine LR to be not everything it's cracked up to be apart from a rip off.
 
Irishrover said:
Britpart give a 24 Month guarantee. Give their Sales Dept. a call-they are very helpful.

Lot of knocking on here about Britpart but I have always been satisfied with them.

Found genuine LR to be not everything it's cracked up to be apart from a rip off.
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True for a lot of things but aftermarket cam followers have always been fragile on Rover V8s. I've seen problems with aftermarket cam followers on Rover V8s for 25+ years - never heard of prematurely failing OEM ones unless they were fitted to a knackered cam.

Unfortunately this issue would have dumped swarf into the engine, it's all very well replacing **** followers with another set of **** followers under warranty but are they going to replace the rockers, rocker shafts, big end shells and mains which will have been contaminated with swarf from failing cam follower?
 
Don't like to kick a man when he's down but I just did a search and I did warn you about pattern lifters in your original camshaft related thread.

http://www.landyzone.co.uk/lz/f10/camshaft-replacement-whats-signs-185659.html

StuckAgainSteve said:
New chain and sprockets would restore cam timing to where it should be, as the chain stretches and the cam wheels wear the timing strays. Unless the cam looks mint (unlikely at that mileage) I'd replace it, replace the lifters with OE ones - many pattern lifters are hopeless - even the branded ones coming from specialist performance cam manufacturers are often not up to the mark.

If any of the cam lobes look heavily worn, then replace the rocker shafts and rockers, swarf from the dying cam lobe invariably ends up damaging them, the mains and big-ends are usually good indicators of swarf-inflicted damage. If they are mint then it's possible the rockers and rocket-shaft are okay - however there's less clearance there so swarf that might pass harmlessly through a big end may wedge itself into the gap twixt shaft and rocker.

You'll be surprised just how bad a state a Rover V8 camshaft can get into before you notice at the wheel!
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Well live and learn. Then again a lot of landrover approved gear is not up to the job.
Take a britpart out the bright blue box and put it in another, and you could be sold a OEM part and not know any wiser. Im sure that goes on a lot
The engines not bad its all the other failing parts around it that will put it beyond its value.
Its now a run around , shooting vehicle on the local farm and a van when we need a large boot space.
tomorrow 2 new lambdas and see if its behaves itself.
If its quiet for a year I will be happy.
 
Willos said:
Well live and learn. Then again a lot of landrover approved gear is not up to the job.
Take a britpart out the bright blue box and put it in another, and you could be sold a OEM part and not know any wiser. Im sure that goes on a lot
The engines not bad its all the other failing parts around it that will put it beyond its value.
Its now a run around , shooting vehicle on the local farm and a van when we need a large boot space.
tomorrow 2 new lambdas and see if its behaves itself.
If its quiet for a year I will be happy.
Click to expand...

Yes that's true, I replaced my trackrod bar with a Britpart one because the Land Rover ones are rubbish anyway! The trick is to know what parts are good and stick with them - like OEM lifters! :D Shame you don't live a bit closer - could try to see if the Britpart Lynx is VIN locked or not by trying to reset your fuel trims - It's not worth the journey for either of us if the outcome is uncertain! (I'm near M25 J25)
 
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