Intermittent miss up to 2k and idle when warm NA-T

Travis89Turbo · 09-04-2012, 11:32 AM

Hey guys. Having a small issue with my Na-T on my 70k miles 2jzge I am running the 4 runner cap on stock dist. To clear turbo. Although still touching intake pipe. Car idles and runs amazing until it gets a little below mid operating temp then it starts to stumble on idle goin to almost 16 on afr. And I loose vac. Down to about 10. Sometimes if I shut it off and start back up it goes away until I warm it up again. It stumbles and hesitates up to about 2k rpm. Never had this problem before the NA-t I haven't really boosted until I get this sorted New cap, New 2j rotor new wires. Will be pulling plugs today. Gone through all connections. No vac leaks, have sprayed everyone. Help me I'm stumped. I have inspected the Bov, and wastegate diaphragms which are in good shape.

Edit..... Car is 95 Supra SE. 70k miles. Stock HG, stock fuel system. New o2 sensors. There is no Check engine light or codes.

Update. I took it for a ride at lunch. This time it started missing and stumbling before even 1/4 to temp. I have no idea what is goin on. I did find that my O2 sensor plug was melted but it is and was still making contact. Any ideas at all. Also I sprayed again every vac Lin and intercooler line with starting fluid including the throttle body. No leaks found at all. I'm lost. Please help

Pretty sure this problem is with my Ignition system. I did have to order a set of spark plug wires so i could run the 4runner cap, i needed #2 wire in the #1 spot for length. While it was idling yesterday i pushed on the plug wire at the dist. and BOOM shocked the hell out of me. I changed it to another one from the "new" kit and it seems to be running better but still intermitenttly will miss and stumble but not near as much. Does any one have ideas??

Okay. Its not the ignition system. I built some MSD wires for it another new cap and rotor from Toyota this time problem with missing got worse and afr are even leaner now. So I went to the fuel system, I unhooked the vac line off the fuel regulator and capped it and it smoothed out a bit but still in the 15s instead of 16.5 on the afr. It also does not take long at all for this to start happening so the problem is getting worse So I am ordering a fuel pump. :crazy2

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
88 non turbo wont idle down	SupraGuy91	MKIII Supra	1	10-17-2012 11:07 PM
Rough idle on warm start up (20 minutes), 87 7MGTE	Bru	MKIII Supra	10	05-11-2012 12:27 AM
idle surging up and down when warm	hemi34	MKIII Supra	1	09-29-2010 04:20 PM
Need help identifying a part and thought on a miss at idle --WAS: newbie	milc80	MKIII Supra	8	06-28-2010 12:53 PM
idle problems	88 supra turbo	MKIII Supra	14	03-13-2010 03:43 AM

09-04-2012, 11:32 AM	#1
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	Intermittent miss up to 2k and idle when warm NA-T Hey guys. Having a small issue with my Na-T on my 70k miles 2jzge I am running the 4 runner cap on stock dist. To clear turbo. Although still touching intake pipe. Car idles and runs amazing until it gets a little below mid operating temp then it starts to stumble on idle goin to almost 16 on afr. And I loose vac. Down to about 10. Sometimes if I shut it off and start back up it goes away until I warm it up again. It stumbles and hesitates up to about 2k rpm. Never had this problem before the NA-t I haven't really boosted until I get this sorted New cap, New 2j rotor new wires. Will be pulling plugs today. Gone through all connections. No vac leaks, have sprayed everyone. Help me I'm stumped. I have inspected the Bov, and wastegate diaphragms which are in good shape. Edit..... Car is 95 Supra SE. 70k miles. Stock HG, stock fuel system. New o2 sensors. There is no Check engine light or codes. Update. I took it for a ride at lunch. This time it started missing and stumbling before even 1/4 to temp. I have no idea what is goin on. I did find that my O2 sensor plug was melted but it is and was still making contact. Any ideas at all. Also I sprayed again every vac Lin and intercooler line with starting fluid including the throttle body. No leaks found at all. I'm lost. Please help Pretty sure this problem is with my Ignition system. I did have to order a set of spark plug wires so i could run the 4runner cap, i needed #2 wire in the #1 spot for length. While it was idling yesterday i pushed on the plug wire at the dist. and BOOM shocked the hell out of me. I changed it to another one from the "new" kit and it seems to be running better but still intermitenttly will miss and stumble but not near as much. Does any one have ideas?? Okay. Its not the ignition system. I built some MSD wires for it another new cap and rotor from Toyota this time problem with missing got worse and afr are even leaner now. So I went to the fuel system, I unhooked the vac line off the fuel regulator and capped it and it smoothed out a bit but still in the 15s instead of 16.5 on the afr. It also does not take long at all for this to start happening so the problem is getting worse So I am ordering a fuel pump. :crazy2 __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!! Last edited by pwpanas; 09-09-2012 at 01:31 PM.