hodge Posted June 17, 2012 Share Posted June 17, 2012 Still having misfiring issues with the car. A little background on it, The car starts to boost and makes 0.3 bar max begins to splutter and bog, AFRs go off the scale lean. Driving off boost it drives perfectly. The fuel pressure is perfect and holds pressure well, I have both Bosch pumps running so its not starved of fuel from the pumps, There's check valves in the lines directly after the pumps, Filter is clear, Ive tried a different ignitor, Replaced coilpack clips, Replaced the plugs, Tried different coilpacks, And the Syvecs is not throwing up any error codes or warnings at all. I'm totally stumped now. All I can now think is I've got a sticky or a couple of sticky injectors, unless anyone has any ideas what it can be. Its ran fine since I've had the car back together, and only started misfiring on the way back from a car show the end of may. Any advice or pointers would be great, Cheers John Quote Link to comment Share on other sites More sharing options...
Noz Posted June 17, 2012 Share Posted June 17, 2012 Before got half way down and read you considering injectors that was my first thought Maybe a connection issue on the injector plugs rather than their operation? If the lume is easy to get to you could check the resistance on the wire possibly (not sure how your lume is wired)? Purely guessing here flame me down if I'm talking rubbish Quote Link to comment Share on other sites More sharing options...
Porky1978 Posted June 17, 2012 Share Posted June 17, 2012 This is pobably going to be one of those easy fix situations (hopefully anyway) A friend of mine had a similar situation with a 200sx turbo. Turned out to be a clogged inline fuel filter. Hope it gets sorted quickly and cheaply mate. Quote Link to comment Share on other sites More sharing options...
peter richards Posted June 17, 2012 Share Posted June 17, 2012 if you have changed the clips go and check that the wires are the right way round , if you have one thats wrong , start the engine and pull off each one starting from the front , engine will die push back on will pick back up , do all six and see if any dont pick back up , at least it will narrow down what cylinders maybe causing the problem . lets hope its a few wires the wrong way round Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted June 17, 2012 Share Posted June 17, 2012 Injector drivers? If it was ignition related you would see rich afr's, not lean ones. Have you checked all ECU and engine grounds are good? Quote Link to comment Share on other sites More sharing options...
hodge Posted June 17, 2012 Author Share Posted June 17, 2012 Before got half way down and read you considering injectors that was my first thought Maybe a connection issue on the injector plugs rather than their operation? If the lume is easy to get to you could check the resistance on the wire possibly (not sure how your lume is wired)? Purely guessing here flame me down if I'm talking rubbish I'm considering just pulling out my loom and checking it all over. I suppose it will remove that from the equation. This is pobably going to be one of those easy fix situations (hopefully anyway) A friend of mine had a similar situation with a 200sx turbo. Turned out to be a clogged inline fuel filter. Hope it gets sorted quickly and cheaply mate. Filters been cleaned dude. if you have changed the clips go and check that the wires are the right way round , if you have one thats wrong , start the engine and pull off each one starting from the front , engine will die push back on will pick back up , do all six and see if any dont pick back up , at least it will narrow down what cylinders maybe causing the problem . lets hope its a few wires the wrong way round They can't be the wrong way around Peter, the car has ran perfectly and developed this issue after a 3hr drive to Lincoln. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 17, 2012 Author Share Posted June 17, 2012 Injector drivers? If it was ignition related you would see rich afr's, not lean ones. Have you checked all ECU and engine grounds are good? No nessessarly. My sensor is in the midpipe, so if there's no spark to combust the fuel then it's going to collect in the cylinders and read lean. Quote Link to comment Share on other sites More sharing options...
peter richards Posted June 17, 2012 Share Posted June 17, 2012 ok , good luck hope you find it and its an easy fix Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted June 17, 2012 Share Posted June 17, 2012 No nessessarly. My sensor is in the midpipe, so if there's no spark to combust the fuel then it's going to collect in the cylinders and read lean. It would read rich mate if the combustion was incomplete. Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted June 17, 2012 Share Posted June 17, 2012 It would read rich mate if the combustion was incomplete. He's right John. My money's on the loom, a bad earth / injector feed or the drivers themselves. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 17, 2012 Author Share Posted June 17, 2012 Ok then, I'll check the loom earths in a bit, and also the engine earths but I'm sure there all good. But no harm in checking anyways, seems I've got no other direction to go. Quote Link to comment Share on other sites More sharing options...
Steve Posted June 17, 2012 Share Posted June 17, 2012 Have you tried removing the fuel check valves? Quote Link to comment Share on other sites More sharing options...
hodge Posted June 17, 2012 Author Share Posted June 17, 2012 Just checked the engine earth and the loom earth and there both secure. I was hoping to find the loon earth had broken but I guess not Quote Link to comment Share on other sites More sharing options...
Guest ugp Posted June 17, 2012 Share Posted June 17, 2012 Try measuring the resistance between the motor and ground, and also the main earth from the syvecs and ground, they should both be near as dammit to 1. If they're both fine, potentially injector drivers? I've seen this happen on the AEM V1 units when they've crapped out. The break-up on these was about 5.5k though. Any loss of sync on the Syvecs? Assuming Ryan's checked the logs? Failing all of the above, check the resistance on each of the injectors, so measure ohms from the 12v feed to them and check each return / ground wire that comes back to the Syvecs. (IGN Off). They should all read the same / near enough. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 18, 2012 Author Share Posted June 18, 2012 Have you tried removing the fuel check valves? Yep, I've tried it with them in and out and it's just the same. Quote Link to comment Share on other sites More sharing options...
mellonman Posted June 18, 2012 Share Posted June 18, 2012 could it be a map sensor failed so its not reading boost? so then going lean, as you build boost does it slowly get leaner of does it drop off at 0.3 straight to lean Quote Link to comment Share on other sites More sharing options...
hodge Posted June 18, 2012 Author Share Posted June 18, 2012 FUEL PUMP ECU, maybe. Iirc, doesnt this still run 7 volts off boost and switches to 12v when the car makes positive boost. If this wasn't functioning correctly and not switching to 12v would thus cause the issues Im experiencing. Quote Link to comment Share on other sites More sharing options...
supradibbs Posted June 18, 2012 Share Posted June 18, 2012 FUEL PUMP ECU, maybe. Iirc, doesnt this still run 7 volts off boost and switches to 12v when the car makes positive boost. If this wasn't functioning correctly and not switching to 12v would thus cause the issues Im experiencing. Sounds about right from the top of my head dude,i know its a pain in the ass mate but clean and flow test of the injectors? Quote Link to comment Share on other sites More sharing options...
hodge Posted June 18, 2012 Author Share Posted June 18, 2012 Sounds about right from the top of my head dude,i know its a pain in the ass mate but clean and flow test of the injectors? I'll try a 12v fuel pump mod tonight when I get in from work, failing that, I'll whip the injectors out to be cleaned and tested. Quote Link to comment Share on other sites More sharing options...
wallis Posted June 18, 2012 Share Posted June 18, 2012 I had a problem like this years ago and it turned out to be a bad connection from the earth strap the one from the block/head to the front scuttle panel, have u checked it's making good contact, prob something u have already checked but just trying to help out ;-) Could be injectors but not all of them surely? Hope u get it sorted hodge, Ellis said the car is unreal, wish I knew u lot were in Lincoln that day, would of come to see u. All the best ;-) Quote Link to comment Share on other sites More sharing options...
dandan Posted June 18, 2012 Share Posted June 18, 2012 It would read rich mate if the combustion was incomplete. Misfiring can, and will often, read lean. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 18, 2012 Author Share Posted June 18, 2012 Does an N/A fuel punp ECU operate at a twin speed like a TT. Because me car was originally an N/A with the original fuel pump ECU. Quote Link to comment Share on other sites More sharing options...
keron Posted June 18, 2012 Share Posted June 18, 2012 the na and jap import fuel pump ecu/relays are the same iirc. only the uk spec one was defo different... try the 12v mod. Quote Link to comment Share on other sites More sharing options...
hodge Posted June 18, 2012 Author Share Posted June 18, 2012 the na and jap import fuel pump ecu/relays are the same iirc. only the uk spec one was defo different... try the 12v mod. I'll do that tonight Keron. Let's hope it's a simple failing pump ECU mate. Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted June 18, 2012 Share Posted June 18, 2012 what a nightmare! hope you figure it out soon bud Quote Link to comment Share on other sites More sharing options...
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