no start after rebuild

discord · 12-26-2009, 10:03 PM

I got them right now, looked at a friends harness. got new coil packs now and have a good strong spark. still just backfires into the intake. all voltages check out. ignition switch is good. refueled gas tank, timing is perfect, no dice. still occasionally backfires into the intake.

cre · 12-26-2009, 10:38 PM

Backfiring into the intake indicates that the intake valves are opening too soon after ignition.... I know of no other way for this to happen than the mechanical timing being off; I am not talking about the spark advance if that is what you are referring to.

discord · 12-26-2009, 11:19 PM

what should I do to fix?

cre · 12-26-2009, 11:31 PM

Bill UK covered it well in pictoral form here: http://www.toyota-supra.info/forums/...on-sensor.html Those three items set the mechanical timing, then you tighten the timing belt tensioner pulley (do NOT over torque it!!!), then you set the ignition timing with the timing light.

discord · 12-26-2009, 11:35 PM

oh ya gotcha, I did that already at least 15 times lol

cre · 12-27-2009, 12:09 AM

Well, I don't know what to tell you then... did you get all the shims back in the right places? Get the cam gear dowels in the center hole on both cam and gear? Perhaps someone else will have a suggestion, but I can't think of anything.

12-26-2009, 10:03 PM	#1
discord Stock Join Date: Dec 2009 Location: puyallup, wa Posts: 16	I got them right now, looked at a friends harness. got new coil packs now and have a good strong spark. still just backfires into the intake. all voltages check out. ignition switch is good. refueled gas tank, timing is perfect, no dice. still occasionally backfires into the intake. __________________ 1991 supra targa turbo full rebuild, garrett turbo, chrome header, custom made adjustable wastegate and matching bov, elec fan, hks evc pro, greddy turbo timer, hks 2.0mm hg, arp head bolts, arp rod bolts, 2.5" intercooler and piping, lexus ls400 MAF. AC, power steering, and clutch fan deleted.

12-26-2009, 10:38 PM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Backfiring into the intake indicates that the intake valves are opening too soon after ignition.... I know of no other way for this to happen than the mechanical timing being off; I am not talking about the spark advance if that is what you are referring to. __________________ 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 --->

12-26-2009, 11:19 PM	#3
discord Stock Join Date: Dec 2009 Location: puyallup, wa Posts: 16	what should I do to fix? __________________ 1991 supra targa turbo full rebuild, garrett turbo, chrome header, custom made adjustable wastegate and matching bov, elec fan, hks evc pro, greddy turbo timer, hks 2.0mm hg, arp head bolts, arp rod bolts, 2.5" intercooler and piping, lexus ls400 MAF. AC, power steering, and clutch fan deleted.

12-26-2009, 11:31 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Bill UK covered it well in pictoral form here: http://www.toyota-supra.info/forums/...on-sensor.html Those three items set the mechanical timing, then you tighten the timing belt tensioner pulley (do NOT over torque it!!!), then you set the ignition timing with the timing light. __________________ 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 --->

12-26-2009, 11:35 PM	#5
discord Stock Join Date: Dec 2009 Location: puyallup, wa Posts: 16	oh ya gotcha, I did that already at least 15 times lol __________________ 1991 supra targa turbo full rebuild, garrett turbo, chrome header, custom made adjustable wastegate and matching bov, elec fan, hks evc pro, greddy turbo timer, hks 2.0mm hg, arp head bolts, arp rod bolts, 2.5" intercooler and piping, lexus ls400 MAF. AC, power steering, and clutch fan deleted.

12-27-2009, 12:09 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Well, I don't know what to tell you then... did you get all the shims back in the right places? Get the cam gear dowels in the center hole on both cam and gear? Perhaps someone else will have a suggestion, but I can't think of anything. __________________ 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 --->

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