7mgte stumble HELP

ccguy · 12-05-2012, 04:16 AM

the cracks under 2 of the coils

cre · 12-05-2012, 04:39 AM

Well, it seems minor but I've never cut up a coil pack to see how they're built.

I have had issues similar to what is in your video from just a hairline crack in the plastic stem of a spark plug boot, toward the top no less... So I wouldn't dismiss it as a possibility. I wasn't affected to the same degree but keep in mind that if it's the coil pack then there are two cylinders firing erratically, not just one.

ccguy · 12-05-2012, 10:40 PM

coil packs made it a little better but still heavy stumble.
if the ground going from the metal coil pack bracket is not hooked up it runs just the same. then if i ground it, it still acts the same. i think i remember reading if it does not have a good ground it will not run right. so what am i missing????
i am testing the plug wires for a grounding crack issue now.

cre · 12-05-2012, 11:03 PM

There's an internal ground in the igniter which is known to corrode and can cause these symptoms. There may be a writeup in the MKIII FAQ section which I think was written by Suprra_girl.

ccguy · 12-05-2012, 11:20 PM

well the plug wires did not shock me so not the plug wires.

i am looking to see if i can find that faq but no luck yet

ccguy · 12-05-2012, 11:56 PM

opened up the igniter and the ground is good and all is clean inside. the alum where the rubber gasket is is corroded but the ground is clean. i am going to extra ground the igniter to the body

ccguy · 12-06-2012, 12:06 AM

just ran a ground just like the faq. so we will see. thanks for the link and all of the help...this will be fixed tonight so i will be checking the computer ever so often to see if anything shows up on the forum. other than that i will be out working on the truck

12-05-2012, 04:16 AM	#1
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	the cracks under 2 of the coils __________________ 1980 toyota 4x4 truck 1987 7mgte motor, 3" exhaust, water to air intercooler. 4.88s locked, dual cases, lift.....

12-05-2012, 04:39 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Well, it seems minor but I've never cut up a coil pack to see how they're built. I have had issues similar to what is in your video from just a hairline crack in the plastic stem of a spark plug boot, toward the top no less... So I wouldn't dismiss it as a possibility. I wasn't affected to the same degree but keep in mind that if it's the coil pack then there are two cylinders firing erratically, not just one. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

12-05-2012, 10:40 PM	#3
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	coil packs made it a little better but still heavy stumble. if the ground going from the metal coil pack bracket is not hooked up it runs just the same. then if i ground it, it still acts the same. i think i remember reading if it does not have a good ground it will not run right. so what am i missing???? i am testing the plug wires for a grounding crack issue now. __________________ 1980 toyota 4x4 truck 1987 7mgte motor, 3" exhaust, water to air intercooler. 4.88s locked, dual cases, lift.....

12-05-2012, 11:03 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	There's an internal ground in the igniter which is known to corrode and can cause these symptoms. There may be a writeup in the MKIII FAQ section which I think was written by Suprra_girl. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

12-05-2012, 11:20 PM	#5
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	well the plug wires did not shock me so not the plug wires. i am looking to see if i can find that faq but no luck yet __________________ 1980 toyota 4x4 truck 1987 7mgte motor, 3" exhaust, water to air intercooler. 4.88s locked, dual cases, lift.....

12-05-2012, 11:56 PM	#6
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	opened up the igniter and the ground is good and all is clean inside. the alum where the rubber gasket is is corroded but the ground is clean. i am going to extra ground the igniter to the body __________________ 1980 toyota 4x4 truck 1987 7mgte motor, 3" exhaust, water to air intercooler. 4.88s locked, dual cases, lift.....

12-06-2012, 12:06 AM	#7
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	just ran a ground just like the faq. so we will see. thanks for the link and all of the help...this will be fixed tonight so i will be checking the computer ever so often to see if anything shows up on the forum. other than that i will be out working on the truck __________________ 1980 toyota 4x4 truck 1987 7mgte motor, 3" exhaust, water to air intercooler. 4.88s locked, dual cases, lift.....

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
help 7mgte	graywolf1969	MKIII Supra	8	03-13-2011 09:34 PM
7MGTE to 7MGE	karu	MKIII Supra	4	10-22-2010 07:22 AM
7mgte to 7mge conversion help	wayzhack	MKIII Supra	7	09-07-2010 08:22 PM
Need help please. 7mgte	Toyota1	MKIII Supra	4	05-22-2010 08:33 AM
7mgte and 7mge question	supraman121	MKIII Supra	2	01-12-2007 09:09 PM