Air Mass Meter Prices.
Discussion
Year WarrentyEbay ones tend to be foreign knock offs. I picked a brand new AFM for my Golf from ebay for £40 to see if it would cure a fault. It did but then created a whole set of new ones. It was crap. Bought a brand new Bosch one from the dealer for £120 problems solved.
Its one of those things where it absolutely pays to buy the genuine article, Although those prices do look hideous !
Its one of those things where it absolutely pays to buy the genuine article, Although those prices do look hideous !
Has your AFM failed ? I hope not as we seem to be mirroring our faults and bolt ons and I could do without another bill.
And on that note, you might want to check the seam along the top of the exhaust Y piece between the lamda and where the pipe turns down to join the main cat, mines sprung a leak....
And on that note, you might want to check the seam along the top of the exhaust Y piece between the lamda and where the pipe turns down to join the main cat, mines sprung a leak....
bigdods said:
Has your AFM failed ? I hope not as we seem to be mirroring our faults and bolt ons and I could do without another bill.
And on that note, you might want to check the seam along the top of the exhaust Y piece between the lamda and where the pipe turns down to join the main cat, mines sprung a leak....
Don't know in short!And on that note, you might want to check the seam along the top of the exhaust Y piece between the lamda and where the pipe turns down to join the main cat, mines sprung a leak....
I have the same problems that other owners seem to have or own up to.
The main problem is replacing the correct part and not guessing it's the right bit
Had the car 3 years now and never really stopped this mild shunting.
So next part AMM buy new ebay? buy new TVR? buy secondhand same age of car maybe same problem?
If that don't fix it then lambdas £200 if that don't fix it.......
You get my point.
I think Moneypit got a great name
TVR Moneypit(2)
I bought my airflow meter off ebay from air flow meter company, err 5198 / 5am to replace a 3am type
on pre cat it works a treat cracking bit of kit for 45£ delivered. Airflow meters are pretty simple devices and this is great to have one as a spare mind you it looked so pretty it s on the car and the original is the spare. Re the shunting (cue blitzracing) look else where unless it is very bad.
Could spend a lot of time talking about "light throttle stumble" and many things can add to it but have you tried different petrols I have settled on esso 95 and in all but the coldest weather runs smooth as an 8 cylinder should be. and thats very very smooth.
on pre cat it works a treat cracking bit of kit for 45£ delivered. Airflow meters are pretty simple devices and this is great to have one as a spare mind you it looked so pretty it s on the car and the original is the spare. Re the shunting (cue blitzracing) look else where unless it is very bad.
Could spend a lot of time talking about "light throttle stumble" and many things can add to it but have you tried different petrols I have settled on esso 95 and in all but the coldest weather runs smooth as an 8 cylinder should be. and thats very very smooth.
Don’t just throw bits at it, I’ve posted loads on this problem, and it’s basically the ECU trying to control the mixture at the ends of its correction range (be it rich or lean, but normally lean). The classic seems to be caused by the longer duration cams TVR use giveing poor airflow just above tick over (about 1500 rpm), and the AFM gives a low reading, so the ECU keeps the fuelling low. Now with the wrong mixture feedback from the lambda's the ECU tries to correct it "on the fly" using short term fuel trim. The ECU already cycles the mixture to keeps the catalysts working correctly, but simply sweeps the mixture too lean during part of this cycle as it runs out of correction range. This is why it "shunts" as the mixture cycles. You might get lucky with a combination of parts with various tolerances that might just increase the fuelling at bit so the problem disappears, but it’s an expensive way of going about it. It can also be made worse mechanical slop in the drive chain. I’ve had some positive results with putting a .8 to 1 ohm resistor in the earth wire of the AFM, that puts about 150mv on the AFM output as the ECU sees it (crude but effective), so it puts a bit more fuel in. This has to be accurate, as it alters the long term trim value the ECU applies at tick over, and if you go to far the catalyst cycle becomes over rich. You need to mointor the lamda outputs to check they keep switching, as you try different values.
Mark
Mark
Thats a $1000000 question....As far as I know there have always been problems with the 14cux and longer cam durations and the TVR tuning exposes it. As I understand it the 4.5 and 5 ltr engines are more prone to it, but not all cars do it. I think its all down to tolerances, both mechanical (like drive train and cam wear ), electrical (like poor ignition) and fuel metering (AFM getting contaminated and the like), so over a period of time all the factors can change, and the shunting becomes more of an issue. Because the ECU is already at its correction limit, it has no ability to compensate for these changes. Frigging about with resistors just gives the system a bit more lee way with the fueling to compensate, but its not total fix, it just helps.
Mark
Mark
GAVC said:
Paul, Bought my AFm (ERR5198) from eBay for £59.90, that's what was fitted when we met up. Damn shame i didn't see the cheaper one
Bought it from Parnexion similar to Item number: 160291867485.
Gavin,Bought it from Parnexion similar to Item number: 160291867485.
I did buy it in the end managed to get it for £40 delivered
Hope i have'nt got egg on my face if it's turns out to be crap
Looks the same to me
Paul
I have a 94' 4.0HC which had the usual problem with shunting. I've recently fitted an MC1 cam from V8Dev which has made a huge improvement to the driveability at low revs and no noticeable reduction in power (no formal power test, purely subjective).
One problem I have had with the AFM/AMM is poor connections which are obviously very important for accurate metering. I'm sourcing a new connector / crimps at the moment to sort this once and for all.
Mike
One problem I have had with the AFM/AMM is poor connections which are obviously very important for accurate metering. I'm sourcing a new connector / crimps at the moment to sort this once and for all.
Mike
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