7mgte issues

[Chello]

I'm having a few problems with my 7mgte, it was running fine up until about a week ago, although rich. It's still running rich, very rich which makes it drink fuel, but seems to be hunting for revs at idle. When driving if I put the foot down in 2nd and wind it out a bit and then into 3rd putting the foot back down it seems to bog down/overfuel itself. I changed the plugs and O2 sensor, both were black. The plugs were only a few weeks old I pulled one out last night cleaned it and got the number off of it, put it back in, when I pulled it out tonight it was black again. I thought I might have had a vacum leak initially but went over the cooler hoses etc and made sure they were tight. Was also thinking that the fuel pump (044) with the factory FPR might not be a good idea. I checked the codes the on Saturday and fixed what came up, haven't had a chance to do it again. Any suggestions/ideas?

[wilbo666]

Might be worth checking the engine coolant temperature sensor resistance, check the TSRM for how to check

If this is faulty it might be saying the engine is too cold and the engine ECU putting in too much fuel as a result...

http://www.cygnusx1.net/Supra/Librar...ction=FI&P=113

Cheers
Wilbo

[Chello]

Thanks will give that a go. just read on another thread about an altenator maybe causing issues, my altenator is carrying on, needs a rebuild but if that if that's gettign worse could that cause the plugs not to be getting enough spark to burn the fuel? Although it moves along fine, just pumping fuel. I checked the TPS resistance but it seemed like 2 of the terminals weren't working I think VTA from memory

[Chello]

Haven't has a chance to check the coolant sensor yet. Haven't left the line hard in it before and did it on the way home, it breaks down up in the rev range in first also so I'm not sure what's going on with it. I pulled the AFM apart the other night, just the sensor out of it and give it a hit with contact cleaner not sure if that has caused some of the issues?

[neal]

I don't think its a good idea to spray the insides of the 7mgte AFM with any cleaners, its not the normal type (Flap, Wire etc) of AFM, rather a Karmen vortex sensor, has mirrors in them that can get smeared.

Refrence "http://www.supraforums.com/forum/archive/index.php/t-404208.html"

[Chello]

OK, so that's why it's idling like crap. Will have to save up and get supporting mods for a Lexus AFM, no point in buying another 7m one. But I'm still stumped on the break down and boggin down when getting on it too hard, could the fuel pump and standard fpr be causing it? I.e if the FPR isn't working properly it's shoving too much fuel in for it to use? With out checking the coolant temp sensor I could understand why it's running rich, but it's having a prick of a time starting now so not sure if that's to do with the afm or not

[Shifty]

intercooler/piping leak

[Chello]

I thought that, I went over it and seemed ok? My boost gauge is tappe in maybe 100mm from the throttle body and it's showing full boost, the only thing I can think of is maybe the rocker cover breathers if they are cracked, they bypass eveything

[Chello]

Ok, scored a tomei FPR so if I get a chance I will fit it tomorrow. Just went over all of the intercooler hoses again with carb cleaner, had a slight leak in the top hose. Took it for a drive and it pumped out black smoke in third. I think the accelerator was on alittle when I tried to reset the tps again so I will leave it for tomorrow and try and sort those issues out, well try to anyway

[Chello]

Well, I checked the collant temp sensor and it seems to be ok, I spent some time setting the tps the best I could with a digital multi meter, seems to have worked ok, still pumping a fair bit of black smoke when going through the gears giving it to it. The TPS also seemed to fix the idle, it just doesn't like some revs as it will pig root down the road when trying to do 70-75 in 4th and in car parks etc, have to keep the revs up in 1st gear so it doesn't bunny hop through. So could the black smoke be contributed to the TPS? LIke further adjusment? I went over all the vacum lines I could see and get to with some carby cleaner and couldn't find anymore. Any ideas/suggestions?

[Chello]

OK, got new plugs again, fitted the FPR. Tested the AFM and it seems to be in spec according to TSRM. Just took it for a drive, still sems to be blowing a fair bit of black smoke but alot smother through the rev range, I tried messing with the TPS again but I only have a digital multi-meter here to it's hard to try and judge when it deflects because it runs out of range. When I fitted the FPR I bypassed the "J-tube" because I felt this would be contributuing to alot of the restriction. Anyone have any other ideas? I don't know how to check for boost leaks apart from on a dyno, but in saying that the Boost gauge is showing full boost and it's plumbed in a couple of hundred mm from the throttle body. Any other suggestions? I am pulling my hair out over this, just wish I could get it sorted

[Chello]

Checked the codes again, had speed sensor etc, cleared them all but I keep getting 51 and 31 coming up. The 51 is for the TPS, aircon and neutral switch true? I don't have anyway of putting the aircon or telling it that's in neutral, from memory it was orginally a auto loom. The 31 is for AFM, well according to TSRM anyways, will that cause it to run like a pig? It's idling a little rough and feels like it dies a little when on boost, like little jolts asif it starves for fuel? The FPR is set to around 40psi on idle. Any ideas?

[Shifty]

if you have an AFM error code and your car is running crap AFRs, you're probably not far from solving the problem

[Chello]

OK, so got another AFM, not doing code 31 anymore which is good. The problem it has now is that after I start it cold and drive it for 5-10mins it decides to cough and splutter, asif it's hitting boost cut, or not enough fuel, it's annoying, I can't drive much more than 20-30kmh when it happens, but it comes on boost etc fine until then.
I removed the original FPR and replaced it with a tomei one, I also messed around with a few toher things before it started doing it.
I put on thicker earth straps, thinking that may have been the problem, but it only seems to do it after the car warms up, which in turn makes me think it's not the FPR or the earth straps.
Any ideas on what it may be?

Edit:
There is a slight tugging/jerking/jolting feeling up higher in the revs aswell not sure what that would be

[Chello]

Ok, replaced the oxygen sensor and it seems to have fixed the weird breaking down after 10 mins driving. Still need to figure out what the jolting is