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The mkiv Supra Owners Club

Yet another problem, engine only working on three cylinders


BOB B

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Just had the AA out, went to start the car this morning and it only just managed to turn over, so called AA. :( :(

 

He removed the conectors on the coil packs one at a time and found that numbers 4, 5, 6, cylinders not working, checked out voltage on each connector all ok. So he moved on to swopping the coil packs and spark plugs around and we decided that there was no fuel getting to cylinders 4/5/6 (no smell iether).

 

I also have a problem with my EGCV actuator not working, (there is a thread in this section), would this have any bearing on my new problem?

 

Has anyone had any experiance with this or knows of what could be the problem, it seams wierd but at the same time it could be something simple, I did try resetting the ECU with the removal of EFI 2 no change, could disconnecting the battery reset more things.

 

Im suposed to take the car into the garage on Monday to get the EGCV problem done but now I'm stuck.

 

Thanks in advance for any help.

 

Bob.

Edited by BOB B (see edit history)
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It would be implausible for three injectors to fail at the same time. There isn't one thing common to just three of the cylinders, all the injectors run off the same common power source but all have individual wires going back to the ECU, so unless something has damaged three in one go (check the ECU plug in the footwell) I wouldn't have thought it'd be that.

 

The FPR is on the fuel rail between cylinders 1 and 2, so if your pump was really feeble it just might be that the pressure is so low only cylinders 1, 2, and 3 get enough fuel in on idle to ignite. Reaching a bit there but considering the problem it's all I can really think of after wiring damage. Try firing up the fuel system with the engine off by bridging +B and FP in the diagnostics port and turning the ignition to II, you should get a loud rushing noise.

 

Are you sure you're getting a spark to 4, 5, and 6?

 

-Ian

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Hi Ian, thanks for having the time to give me some input on this, I know it sounds a wierd fault.

 

The AA man didn't actually prove the spark with the plug out but he did test all the signals getting to the connectors and he did change all the coil packs and plugs around and the fualt stayed on the back three cylinders.

 

I also can not see 3 injectors suddenly defecting I'm just wondering about the ECU signal, but to have three non random cylinders go down, could it be anything to do with the resistor pack? I'm taking that off soon to test thier resistance.

 

I havn't done the fuel thing yet but I would have thought that there would have been a strong smell of fuel when he took the plgs out and there wasn't.

 

Thanks again.

 

Bob.

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Really odd one this, i guess you could double check for a spark on all cylinders by taking out the coil packs out and connecting a set of plugs and turning the engine over.

 

Three injectors not functioning is rather high odds, i guess its possible for a resistor pack problem, you can check this with a meter.

 

Are you sure there is fuel getting to the other cylinders and its not a fuel feed fault?

 

Otherwise i would agree with Ian that there may be a connection problem from the ECU or associated part of the loom.

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I'm not sure about the fuel feed, though the fuel feed pipe comes in at the 4/5/6 cylinder end of the injector fuel pipe, so logic would point towards, that if there was a fuel feed problem it would effect all the cyliders.

 

Sorry but I'm just trying to bounce ideas about, I'm just going to test the resistor pack now I'll also go and take a BIG hammer to the ECU and the engine I'm going to give a good tourching, I'll let you know the outcome.

 

Bob.

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OK, it won't the wiring for that then :) Check one of the pins to each of the injector plugs on the 3 "missing" cylinders has 12 volts positive with the ignition on. Hell, I never thought *I* would give electrical advice ;) Ryan's probably a good bet for few ideas, he just rang me, I know he's working at the moment, he may see this later though.

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Thanks Chris any advice from you elec or not is usually good. Chris I will get back to you after I get the car back to talk to you about gaskits for 1st to 2nd decats, I'm pretty sure mine hasn't got one in and its blowing a bit from the joint.

 

Thanks Matt also, unfortunatly I've been up in London for a day and just got back, the car is being picked up tomorrow morning 0800 to go to the garage, if only we could have talked earlier, because I can only imagine that its an elec problem and a spare ECU would have been a good tool, though is your spare a UK one.

 

Thanks again.

 

Bob.

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I;ve just had some pretty shitty news from the garage, they popped the plugs out and he said that the one in number 6 cylinder looked very crappy so the first thing they did was a compression test on 6 and he said there was no compression at all, nothing, he said that the others seamed OK.

 

Now, he says my options are:- he takes the engine out strips it down finds out whats wrong and sorts it, but if the chamber is damaged it would be ridiculusly expensive to sort, he says anything from £2000 to £6000, the last one he did was £5000.

 

Try to source a UK engine to replace mine, still will be v expensive with an unditermined wait time and you don't know what you'll get.

 

Or I try to sell the car one way or the other and save up for a new one.

 

Can anyone think of ant other alternatives, do the estimated prices seem right, should I consider getting one of the Clubs "garages" "people" to have a look and get a second oppinion.

 

A very unhappy Bob.

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I,ve replied to your PM Matt then I looked at this, a little bit of confusion, the cylinder problem was completely seperate from the EGCV actuator problem and only happened on Wednesday.

 

I went out to the DIY store just down the road, when i came out and started it I had this cylinder problem, I managed to drive it back home (2 miles), then the AA story starts.

 

Bob.

Edited by BOB B (see edit history)
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Hi Mate, you're right I am having a nightmare I realy don't know which way to turn, I am BPU and I hadn't considered the FCD, when I get the car back thats one of the things I need to look at.

 

Neither the AA or the garage have mentioned the fluids and untill yesterday neither had I, but I would have thought that if I have a major problem with compression on one cylinder, sugesting some sort of failure, then I would expect that to show up in one of the fluids.

 

Bob

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Lol, figure out of the sky. Thought it was between 2 & 3k. Even better.

 

Anyway... about that lower engine cover :innocent:

 

will have one. my internets playing up so trying to get it sorted. will be back online tomorrow properly in the afternoon so can sort everything out then...

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