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Jim Bob

Getting Comfortable
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  1. ... you were right all along! Many thanks Steve!

  2. After much back and forth the problem has been solved! In the early days, JE suggested the problem lay with the ECU / fuelling and proposed an £1800 upgrade and dyno set up but I wasn't convinced it was fuelling as the problem was there irrespective of whether LPG or petrol was selected. Heeding the advice given on this forum, I earthed the ignition circuit out through a spare plug, and immediately, the problem was obvious; there was no spark at first but after a few revolutions of the engine, a spark appeared and the engine fired. This isolated the problem to the ignition circuit but which part was unclear. The car was sent back to JE with this diagnosis and they investigated the problem and reported back today that it was a faulty coil!! Remember this post? "Task 4 - As the ignition circuit included a non Lucas coil and distributor, JE suggested that keeping the ignition set up as near to standard as possible would make the car more reliable and easier to diagnose faults in the future. They fitted a Lucas PRC6574 coil, an ADU7242L suppressor and a ERR4738 distributor." I / we were misled by the original diagnosis that the mods to the plenum and inlet tract had caused a fuelling problem. If I had placed less faith in brand new components from Lucas then I would have saved myself a whole lot of hassle; so much for "keeping the ignition set up as near to standard as possible [making] the car more reliable and easier to diagnose faults in the future"!!! This just goes to reinforce the old (and wise) advice to eliminate the simple and most obvious faults first before jumping to complex and expensive solutions! Thanks everyone for your advice on this one, I am much obliged!!
  3. Hi Everyone When the car was placed with JE they undertook the following: Task 1 - The car had a problem in as much as the idle, whilst the vehicle was in motion, was about 1800rpm which caused a problem if I was trying to negotiate traffic in a built up area as 1800 in second or third gear produced quite a speed, (the only way I could moderate the speed was to constantly dip the clutch). Once the car came to a halt, the idle dropped down to around 900rpm. The stepper motor was replaced but this did not resolve the problem so JE suggested that the problem was that the ECU was mapped for a 3.9 litre (not the 3.5 to which it was mated) and so was overfuelling at idle. I do not know what JE did to rectify the problem but the problem has now abated. Task 2 - JE relocated the LPG ECU from the engine bay to the cabin. Task 3 - JE supplied and fitted an enlarged plenum and 45mm trumpets and relocated the stepper motor from the bulkhead side of the plenum to the offside. (there are no obvious leaks on the plenum, AFM, vacuum pipes etc) Task 4 - As the ignition circuit included a non Lucas coil and distributor, JE suggested that keeping the ignition set up as near to standard as possible would make the car more reliable and easier to diagnose faults in the future. They fitted a Lucas PRC6574 coil, an ADU7242L suppressor and a ERR4738 distributor. All in all, this work cost me £2400 and as I said, the car was returned running like a dog on petrol and with very poor starting. It was returned to JE and they changed the timing to get the car running on petrol (to 10 degrees BTDC) but to my frustration, the poor starting remained. Once warm , the car runs really well but during the warming up period, it is a little hesitant. Other than this problem the car runs really well and as it is serviced every 3000 miles or so I would say that for a 30 year old car it is in really good condition. There is a fuel pressure regulator fitted to the fuel rail (FSE FPG002) and fuel pressure is good. I agree that JE should put it right and I am suprised that a company with such a great reputation is floundering a little. Like I said, I have every faith they will put it right eventually as they have a legal as well as a moral obligation to do so. I really do not like confrontation at all so I hope that JE do the right thing. Regarding feedback from you all, I am very grateful and I dont want people falling out over it. It is only a car after all!! I have written to JE and asked them what they propose to do. I guess I will have to wait and see if their reputation is justified. Thanks again
  4. I have had a good look at all of the vacuum pipes and although the pipe to brake servo looked a bit pinched under the jubilee clip, upon removal it had not pierced the hose. I cut off the end of the hose and reconnected it. I also tightened all of the grub screws that hold down the plenum and also those that hold the repositioned IACV and the blanking plate used to seal the old IACV mount. None of this made any difference. Then I thought about the comment about the engine starting on petrol then flipping to gas. The car is set up to start either on gas or on petrol- I can select manually what fuel type and the starting problem is there irrespective of what fuel type I select. If the problem of poor starting is caused by the ECU needing to be remapped as JE suggest then BOTH ECUs would need to be mapped wouldnt they? As the problem is just as pronounced on either fuel type does this not suggest that the starting is NOT ECU related? BTW, the LPG system is an OMVL multipoint. During the time spent investigating all of the hoses and connections, I did notice that the powder coating on the plenum had been damaged on a housing that contained a grub screw to the right of the throttle body, (it looks like the sort of damage caused by a lever being used). I have trawled the web and I think that this grub screw is the 'base idle adjustment' and as the tamper cover is no longer there it probably means that this has been adjusted. If this has been adjusted could this be contributing to the problem?
  5. Having considered the advise I have read up on Megasquirt and made contact with www.v8developments.co.uk for some advice. I will let you know how I get on... Thanks to everyone- I appreciate the pointers
  6. HI everyone and thanks for the advice. The mods were made by JE Engineering in Coventry so they should know this unit and the injection system well enough. However, their ECU man left recently to join Jaguar/Land Rover so whilst the remaining members of staff were able to swap the hardware they did not give a second thought about remapping the fuelling to account for the extra air flow. This has left a bitter taste in my mouth as I thought I had picked my supplier well enough. They are trying to find someone who can remap the ECU but four weeks on they have not resolved the problem; hence my request for potential (and reliable) suppliers but it would seem that there is not a long list (if any) to choose from. If anyone knows of an experienced company who can (and is willing) to fix this problem do please let me know. Thanks Rob PS- the IACV was moved as in its original position, it fouled the bonnet catch mechanism of the Triumph!!
  7. I run a 3.5 V8 with stage three heads, hot cam, Hotwire EFI from a 3.9 RR and a multi point LPG system in my Triumph TRV8. Recently a reknowned Range Rover / Land Rover specialist fitted a modified (enlarged) plenum, a 45mm trumpet set and also relocated the IACV (stepper motor) to the offside face of the plenum (see photo). However, since these mod's were made, the car really struggles to start on both petrol and gas. The engine spins for ages and will eventually fire if you pump the throttle (before the mods, the engine fired without problems). The specialist thinks that the ECU will need to be remapped but their Hotwire specialist has left the company and they do not have anyone who can carry out the remapping. To give them there due, they are trying to find someone who can do the work for me but so far they have not succeeded. So, can anyone on this forum suggest a reliable company who knows the hotwire system and can remap the ECU? One local to where I live would be great (Basingstoke, Hampshire). Thanks Rob
  8. Hi all, I have recently had an R380 gearbox fitted on my Triumph TRV8, replacing an old LT77. The new 'box, although only a few weeks and a couple of thousand miles old has already developed a leak from the rear oil seal and MTF94 is now adorning my garage floor in ever increasing quantities. The TR specialist that supplied and fitted the replacement box said that it is 'quite normal for the R380 to loose a little oil from the rear seal'. I think this is b******t but I thought that I would seek the wisdom of those who would know more about these 'boxes than anyone else hence this post to this forum. So, is this normal for the rear seal to weep/ leak??? Thanks Rob
  9. Hi all, Can anyone recommend a reliable supplier in the UK of reconditioned Air Flow Meters for a hotwire 3.9 on a 1993 plate?
  10. Hello all, I have recently converted my TR7 V8 from a Holley carb to a Hotwire EFI from a 3.9 Range Rover Classic and also had a LPG system fitted at the same time. Since having the conversion done, I have a really niggly problem that my friends on the Triumph forum have been unable to solve so I thought I would turn to the experts! Can anyone help? When the car starts from cold and the car is still stationary, the revs pick up to about 2000 for a few seconds and then settle down to around 1000. Once I start to drive, the 'idle' revs pick back up to about 2500 and then stay there (almost as if the throttle is stuck open). When I bring the car to a standstill, the idle revs drop again to 1000 and whilst I remain stationary, the revs remain low. Once I start to move again, the 'idle' picks back up to 2500 and this scenario just continues. There is a work around which may well point the more knowledgable to suggesting the cause of the problem. The solution is to turn off the ignition once the engine is warm and then to restart the engine. When I do this, the 'idle' remains at the 1000 mark. If I dont do this, the problem just persists for mile after mile after mile. I dont think it is a problem to do with the LPG as the condition remains the same regardless of whether it is running petrol or gas. Please help! It is really detracting me from enjoying the torque and horses.
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