Discussion
Hi
A little help and advice from those who s knowledge is invaluable please.
My griff 4.3 cat seems to be overfueling,at the growl we swapped out the afm for a new one and it didn't make any difference,we reset the ecu and that made it worse.
So the question is where do I start to look to cure the problem or do spend the money on the megasquirt option ?
Am I right in saying this option is about 700 pds
I don't want to waste money if this is a better option.
Many thanks pete
A little help and advice from those who s knowledge is invaluable please.
My griff 4.3 cat seems to be overfueling,at the growl we swapped out the afm for a new one and it didn't make any difference,we reset the ecu and that made it worse.
So the question is where do I start to look to cure the problem or do spend the money on the megasquirt option ?
Am I right in saying this option is about 700 pds
I don't want to waste money if this is a better option.
Many thanks pete
Megasquirt is a bit premature for this... The ECU simply puts in the required amount of fuel depending on the sensor inputs, such as AFM, water temp, RPM, and to a small extent throttle pot. As you have already tried the AFM, you can rule this out, but is the wiring OK- theres a tendency for the loom / connectors to get damaged. Also check the resistance of the water temp sender for the ECU (this is not the same as the one for the dashboard gauge) You can do an easy test as both the water temp sender and fuel rail temp sender have the same values resistance wise, so you can simply measure the resistance of both senders ON A COLD engine and see if they are the same. As you have catalysts the ECU should have tiggered a fault code if its running too rich, and may be in fallback mode anyway. To detect this you need either a ECU basic code reader, that gives you a 2 digit fault code- not that they always do-, A Steve heath ECUmate that gives you all the sensor data and fault codes in a hand held unit- although I gather he's not selling them at the moment, but a new web site is due soon, or the Freeware RoverGauge I started a topic on.
There are also mechanical reasons for running rich like a faulty fuel pressure regulator, or missing vacuum pipe from the fuel pressure regulator, or possibly a misfire that can get mistaken for an over lean mixture, so the ECU overcompensates.
There are also mechanical reasons for running rich like a faulty fuel pressure regulator, or missing vacuum pipe from the fuel pressure regulator, or possibly a misfire that can get mistaken for an over lean mixture, so the ECU overcompensates.
Edited by blitzracing on Tuesday 12th June 18:00
Edited by blitzracing on Tuesday 12th June 18:05
I can really recommend trying a ECUmate before you start splashing the cash on what is probably a pointless expense when as pointed out it's likely to be a sensor, setting or a combination of a few things.
As an example my overfuelling ended up to be a symptom of a worn cam one everything else had been tried and ECUmate would have spotted that sooner.
As an example my overfuelling ended up to be a symptom of a worn cam one everything else had been tried and ECUmate would have spotted that sooner.
Mine to was overfueling, especially dumping in a load of fuel in low revs from which it never recoverd up the rev range.... will be checking all sensors, wiring etc, bearing in mind we had to change the thermostat onsite on the Saturday, and prior to that every seemed fine .... so I'm hoping its something simple like a broken cable/dry joint or somethink just clipped back just so
EGB said:
Useful valuable topic this. Soluton/solutions very well worth noting for future reference. But, sory its happened to you guys. One for the RV8 book of golden electronic fixes!. Sensors, afm, tp, ecu, igniton, fuel prssure what ever!
Totally agree... my car over last 5 year has conisitantaly delivered around 280bhp..... both before and after engine rebuild, so has to be a sensor or serious component failure in less then 3000 miles of rebuild.... but fuel map suggests sensor failure in my headEdited by EGB on Tuesday 12th June 22:31
Steve. Hope back tracking on your thermostat change may show something loose? Then an easy fix. I think there is a sensor near there somewhere. Check a spade connector is not loose or brocken. They could all do with an emery scrape/electrcal fluid cleaner, clean up. Probably they could have done with this before they left the TVR factory assembly line. If the wire conection is hanging on with just a few threads, the resistance will be high and the signals may not be getting to the ECU ?? correctly.
Steve, don't try the emery scrape clean up on your head sensors! A large soft shamoux (spelling?) leather is better for this !! Good luck, keep us all informed of the fix. Cheers.......Eddie
Steve, don't try the emery scrape clean up on your head sensors! A large soft shamoux (spelling?) leather is better for this !! Good luck, keep us all informed of the fix. Cheers.......Eddie
Edited by EGB on Wednesday 13th June 14:05
EGB said:
Paul, FFG I think you can contribute to this overfueling? I believe you had this problem sometime back. What was your fix Thanks.
Still got my bank dropping out and after some conversations at the weekend the pointers are to the earths splined into one but haven't had time to check yet. My cutting out is better after changing the ECU, and gained some BHP and torque. To be honest I'm hapy if it just runs now! Mine stinks nearly as bad as Hoovers and the fuelling graph from last year wasn't too bad TBH. I have to hold my breath before reveresing into the garage and get out quickly, shutting the garage 10 minutes later. Think its just a precat thing.
FFG
Thanks Paul. We have some good guys in on this now including (us experts?) There are a few more out there more than welcome to join in. Need to keep this topic going, hopefully as a benchmark for understanding and curing overfueling. What with noid lights, ECUMATE, and good guys etc, etc there is now a better chance.
Myself, just got out of Lansley's NHS garage. Arterial bye pass into my accelerator foot. On morph reduction now. Will go easy with Griff, with crutches in boot tool kit. Very handy!
Myself, just got out of Lansley's NHS garage. Arterial bye pass into my accelerator foot. On morph reduction now. Will go easy with Griff, with crutches in boot tool kit. Very handy!
David Beer said:
Do not know if caught my above message? My car was over fuelling and after a run to Glasgow and back in a day my car lost compression due to bore wash, maybe ok on shortish drives, but from Cirencester to Glasgow and back, not.
David. How did you fix your over fuelling? ThanksGassing Station | Griffith | Top of Page | What's New | My Stuff