7mgte no spark

tenmetalman · 02-21-2010, 06:53 AM

Hello,
I have a 88 supra that I've rebuilt the engine in that's showing the same problems. I've confirmed the coils have the necessary 12 volts. earlier posts indicate a ground wire is indicated between the coil pack & the engine ? one of the tests have you checking that NO ground exists ? I'm really climbing the wall, the cars been ready to start for weeks...... I performed the test to confirm the fuel pump works, it does... I also have the engine light on when the key is off ? this is really a "pip", putting it nicely. as the other people have nicely stated "HELP"
Paul

cre · 02-21-2010, 07:49 AM

One of you (or all of you) pull the fuel pump relay, jumper FP and +B in the diagnostic box, reconnect the car battery and see if the CEL still comes on with the key at "off". Try starting too if you like, although I doubt that's what's preventing your vehicles from starting.. I think the main EFI relay is more likely.

cre · 02-21-2010, 07:34 PM

Quote:

Originally Posted by Benesesso

When I put the new starter in, there were two wires which had large hole connectors on their ends, in addition to the primary battery cable. The two smaller wires were together, indicating they were attached to the same place...

...I wonder if these wires are grounds instead of hot wires...

They are grounds they connect to the lower intake plenum... post the wire colors and I'll double check for you, but I'm quite sure I know what wires you're talking about.

Quote:

Originally Posted by Benesesso

Would a problem with the EFI relay cause a no-spark condition?

Sure, ECU doesn't get power when it needs it.

Green7mgte · 02-22-2010, 01:42 AM

Quote:

Originally Posted by Benesesso

Cre,

You NAILED it!!! Moved the 2 wires to a plenum bolt and it fired right up. One wire was white with red tracer dots, the other brown with blue dots.

Many thanks! Next time you're near Phoenix the drinks are on me.

glad to hear this problem finally got solved for you ben. its been what? a month?

MA70-3.0GT · 02-22-2010, 06:16 PM

Crikey o reilly, & I thought a BHG was a swine!!! Glad you got sorted in the end, are you taking any action about the bodged & wasted new starter or have you not had time to think about that sort of stuff yet? I'd be shoving a lawyer down their throats about now...

tenmetalman · 02-23-2010, 03:34 AM

cre,
I second Benesesso, You nailed it ! ! ! I moved the two wires to a ground stud as described ....... She fired up ASAP................ I had invested an additional 8 1/2 hrs testing per the book before reading your post. I was out there at 8:00p.m. tonight to try it Thanks, thanks, thanks
Thanks again

supra.7mgte · 02-23-2010, 06:27 AM

well its good to know that few other guys are getting their cars running but i have decided that im going through the engine wiring harness wire by wire due to the fact that i know that i have all the grounds hooked up and that i have found some wires that are not in the wiring diagram and i have no idea wut they go to... so instead of guess im going to go through it all so i know wut wire is wut and i that i can remove anything that doesnt need to be in there engine compartment. it may take a while for me to get this down i only have an hour or two a day to work on it. ill keep every one updated on the status of it and when i get it running

02-21-2010, 06:53 AM	#1
tenmetalman Stock Join Date: Apr 2009 Location: morganton, nc Posts: 2	7mgte no spark & fuel pump rely buzzing Hello, I have a 88 supra that I've rebuilt the engine in that's showing the same problems. I've confirmed the coils have the necessary 12 volts. earlier posts indicate a ground wire is indicated between the coil pack & the engine ? one of the tests have you checking that NO ground exists ? I'm really climbing the wall, the cars been ready to start for weeks...... I performed the test to confirm the fuel pump works, it does... I also have the engine light on when the key is off ? this is really a "pip", putting it nicely. as the other people have nicely stated "HELP" Paul

02-21-2010, 07:49 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	One of you (or all of you) pull the fuel pump relay, jumper FP and +B in the diagnostic box, reconnect the car battery and see if the CEL still comes on with the key at "off". Try starting too if you like, although I doubt that's what's preventing your vehicles from starting.. I think the main EFI relay is more likely. __________________ 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 --->

02-22-2010, 06:16 PM	#5
MA70-3.0GT 12psi boost Join Date: Oct 2009 Location: Crewe, England Posts: 356	Crikey o reilly, & I thought a BHG was a swine!!! Glad you got sorted in the end, are you taking any action about the bodged & wasted new starter or have you not had time to think about that sort of stuff yet? I'd be shoving a lawyer down their throats about now... __________________ '89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit... '89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks... '83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks '95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it I'm not paranoid, they really ARE after me!!!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
No spark mystery on 7mgte	jcgrant4	MKIII Supra	9	08-19-2009 06:21 PM
No spark issues	DDBT	MKII Supra	2	01-06-2009 07:08 AM
7mgte swap no spark	supra4life1386	MKIII Supra	5	11-27-2008 07:57 PM
NGK Spark Plugs	91 Supra	MKIII Supra	5	08-07-2007 03:52 AM

02-23-2010, 03:34 AM	#6
tenmetalman Stock Join Date: Apr 2009 Location: morganton, nc Posts: 2	cre, I second Benesesso, You nailed it ! ! ! I moved the two wires to a ground stud as described ....... She fired up ASAP................ I had invested an additional 8 1/2 hrs testing per the book before reading your post. I was out there at 8:00p.m. tonight to try it Thanks, thanks, thanks Thanks again

02-23-2010, 06:27 AM	#7
supra.7mgte Intake Join Date: Feb 2010 Location: Alberta Posts: 36	well its good to know that few other guys are getting their cars running but i have decided that im going through the engine wiring harness wire by wire due to the fact that i know that i have all the grounds hooked up and that i have found some wires that are not in the wiring diagram and i have no idea wut they go to... so instead of guess im going to go through it all so i know wut wire is wut and i that i can remove anything that doesnt need to be in there engine compartment. it may take a while for me to get this down i only have an hour or two a day to work on it. ill keep every one updated on the status of it and when i get it running