Guest Black1997 Posted July 31, 2016 Share Posted July 31, 2016 I'm new to this forum but I am on Supra forums. Iv got a 97 single with a t76 running aem v1. I just purchased the car last week and this idling problem started yesterday. At first it would surge/lope at idle and that progressively got worse. Yesterday it would shut off everytime I came to a stop light. I pulled the iacv just now and cleaned it. That didn't seem to make a difference. It's a tempormental thing. If I rev it up without the clutch in, it doesn't die but gets pretty low. If the clutch is in she dies. Any suggestions on this? Also this maybe a very elementary question.... Can I still pull codes with the aem from the obd2? Or is it all through the aem? It's hard figuring out stuff when I didn't build that car but I enjoy it. Anywho I'm glad to be here on the forum, Iv had a tt 6speed bpu and an na in the past. So happy to have another again. Any advice on this issue would be a tremendous help. Thanks! Quote Link to comment Share on other sites More sharing options...
BoostJunky86 Posted July 31, 2016 Share Posted July 31, 2016 Where did you buy it from. Surely a warranty of some sort hopefully. Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted July 31, 2016 Share Posted July 31, 2016 From a private party so there is no warranty. It runs super strong, it's just that idle issue. Quote Link to comment Share on other sites More sharing options...
BoostJunky86 Posted July 31, 2016 Share Posted July 31, 2016 Mines started to get really lumpy lately. Have you checked plugs? Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted July 31, 2016 Share Posted July 31, 2016 I pulled one out today and it looked just fine. I'm about to go out in the garage and pull the rest. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 1, 2016 Share Posted August 1, 2016 I don't like the fact it stalls when you have the clutch pedal depressed, this sounds like excessive crankshaft thrust bearing friction. Could conceivably be clutch release bearing friction. Are there any whirring noises with the clutch pedal depressed? What clutch is fitted? Get a garage to check the crank end float!! Quote Link to comment Share on other sites More sharing options...
and1c Posted August 1, 2016 Share Posted August 1, 2016 Boost Leak? Is there a wideband gauge in there? what are your AFRs reading as? Does it go well under full throttle/load Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted August 1, 2016 Share Posted August 1, 2016 AFM or MAP sensor? Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted August 1, 2016 Share Posted August 1, 2016 (edited) Thank you for all your replies. I took the day off to try and figure this thing out. The car runs fantastic under a load. I pulled all the plugs and they all seem normal. This morning I cranked the car and let it idle in the driveway for about 20min. I could not get it to idle rough or shut off. Only once did it do it and that was with the clutch engaged. I think I can rule out the clutch being engaged or not as contributing to the problem. It makes no difference in rpm if I am at idle depressing it or not. Also no strange noises with it depressed. As for afr. I'm around 14 at cruising speed and about 11.3 at wot. Again it didn't stall out one time during my cruise, all was normal. Ill keep tinkering and checking back periodically throughout the day. Can I pull codes through the obd2 if the car has a standalone? Sorry if it dump question. I'm very mechanically inclined I just have 0 experience when it come to standalones so this is a learning experience for me. Thanks Edited August 1, 2016 by Black1997 (see edit history) Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted August 1, 2016 Share Posted August 1, 2016 I don't like the fact it stalls when you have the clutch pedal depressed, this sounds like excessive crankshaft thrust bearing friction. Could conceivably be clutch release bearing friction. Are there any whirring noises with the clutch pedal depressed? What clutch is fitted? Get a garage to check the crank end float!! The car has a RPS pressure Plate. Also a RPS 6 puck Carbon clutch Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 1, 2016 Share Posted August 1, 2016 I would imagine if you have the AEM lead and software you can view sensor outputs in real time, and even possibly log them. That would be a Godsend for diagnosing something like this. I doubt you will have a fuel pressure sensor, but if it persists it *MAY* be useful to monitor fuel pressure at the rail with a remote gauge on a really good high pressure braided hose. Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted August 1, 2016 Share Posted August 1, 2016 That's a good idea. There is a fuel pressure gauge hooked up to the regulator that's routed behind the intake manifold. That pressure seems great. I just did a boost leak test and did find a leak where the throttle body bolts to the intake manifold. It's pretty audible standing close to the car. I put 20psi of pressure in the system. I don't know if this would have anything to do with it. What do y'all think? Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted August 3, 2016 Share Posted August 3, 2016 Maybe this will help figure this out as well. That car has been idling fine but I took it out last night and it was breaking up some under wot. Now I'm running rich. Around 10.5 at cruising speed Quote Link to comment Share on other sites More sharing options...
Scooter Posted August 3, 2016 Share Posted August 3, 2016 Does this not point to dodgy one/some coil packs or their connections? Quote Link to comment Share on other sites More sharing options...
Guest Black1997 Posted August 3, 2016 Share Posted August 3, 2016 I did notice when I checked the plugs the other day 4 out of 6 coil connectors are broken on the inside. The little white clips on the inside of the plugs were brittle and fallen apart. I ordered all new clips yesterday. It's not misfiring though so I assume they are making good contact Quote Link to comment Share on other sites More sharing options...
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