Help, no power....

Supra chick's dad · 07-11-2007, 08:02 PM

Yes, I have a ground cable fron the neg batt side to the block and the trans to the body and the firewall to the exhaust manifold. All factoy points. I am thinking it may mean something in the electrical system is shorting to ground, but how would you know what and where? I also tried un plugging each sensor while at idle and non of the above mentioned sensors (Except the 02 sensor) made any difference in the idle or ability to rev.

supramacist · 07-11-2007, 10:31 PM

Have ya check'd the codes Daddy-O ???

The codes will tell you exactlly what you need to do.
It sounds like the afm. But hell. It could be a few things.

IHateHacks · 07-12-2007, 10:53 AM

There is also a ground on the lower intake manifold. It's brown and white wires going to 1 ring terminal that bolts to the lower intake manifold.

Did you check the ignition timing? Whats it at?

Supra chick's dad · 07-12-2007, 01:42 PM

Yeah, checked but there were no codes. I pulled the connector off of the tps while it was running, that threw a code, so I know it's keeping a record. I am thinking the zap is possibly as simple as static electricity as I slide off the seat. I see the car is well grounded and it really shouldn't have electricity running through it at a noticable zap (slight as it is) capacity. I am going to swap out the fuel filter, as I have fuel pressure (38lbs) but might not have enough volume to get it off idle. Also will try pulling the exhaust loose at the ex. manifold to eliminate a blocked cat. Other than that I am at a loss right now. Maybe the ECU??? Where is the best place to get a new ECU anyone?

Supra chick's dad · 07-12-2007, 01:59 PM

Ok, timing I have not checked and compression or vacuum either. I will. Dang the thing runs so smooth at idle, like a new car should. Also starts right up, not like retarded or advanced timing, or low compression. And the cam sensor wasn't moved during the engine swap. Contacts inside have correct air gap. I took the hose off at the throttle body to eliminate any possible restrictions in the air supply, no difference. I am thinking it has to be either blocked exhaust since it has weak pressure at the tailpipe or low fuel volume or just a bad ECU. It ran fine before the previous owner ran it dry. Sat for 2 years then got a used (Under 50K) motor. I drained the fuel lines and tank and put in fresh fuel too. New spark plugs also.

cre · 07-14-2007, 07:49 AM

Okay, first off where in CO are you?

Second, test the TPS per the instructions detailed in the TSRM: http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101

EDIT: Oh, and I've seen 7M's idle smooth as silk even with the timing off by 15?. Mine. It's part of the beauty of an inline 6.

supradaddy0803 · 07-14-2007, 03:37 PM

Yeah hes right I would check your timing belt and make sure everything is peachy there then next make sure your ignition timing is dead on. My 86.5 ran like that when I bought it because the guy just did the timing belt and it did the same thing it was like a tooth off and thats all it took to drive me nuts for a while. Also besides just your fuel filter check the fuel pressure regulator if it isnt letting the pressure build up then you wont have enough fuel pressure to run at anything higher than idle.

07-11-2007, 08:02 PM	#1
Supra chick's dad Stock Join Date: Jul 2007 Location: Colorado Posts: 13	Help, no power Yes, I have a ground cable fron the neg batt side to the block and the trans to the body and the firewall to the exhaust manifold. All factoy points. I am thinking it may mean something in the electrical system is shorting to ground, but how would you know what and where? I also tried un plugging each sensor while at idle and non of the above mentioned sensors (Except the 02 sensor) made any difference in the idle or ability to rev.

07-12-2007, 01:42 PM	#4
Supra chick's dad Stock Join Date: Jul 2007 Location: Colorado Posts: 13	Yeah, checked but there were no codes. I pulled the connector off of the tps while it was running, that threw a code, so I know it's keeping a record. I am thinking the zap is possibly as simple as static electricity as I slide off the seat. I see the car is well grounded and it really shouldn't have electricity running through it at a noticable zap (slight as it is) capacity. I am going to swap out the fuel filter, as I have fuel pressure (38lbs) but might not have enough volume to get it off idle. Also will try pulling the exhaust loose at the ex. manifold to eliminate a blocked cat. Other than that I am at a loss right now. Maybe the ECU??? Where is the best place to get a new ECU anyone? Last edited by Supra chick's dad; 07-12-2007 at 01:47 PM.

07-14-2007, 03:37 PM	#7
supradaddy0803 12psi boost Join Date: May 2006 Location: Athens, TX Posts: 308	Yeah hes right I would check your timing belt and make sure everything is peachy there then next make sure your ignition timing is dead on. My 86.5 ran like that when I bought it because the guy just did the timing belt and it did the same thing it was like a tooth off and thats all it took to drive me nuts for a while. Also besides just your fuel filter check the fuel pressure regulator if it isnt letting the pressure build up then you wont have enough fuel pressure to run at anything higher than idle. __________________ 1987 supra NA 5 speed 1JZGTE swap Tokico Illumina 2 and Eibach springs Tokico pillow blocks Suspension Techniques front and rear sway bar HKS super dragger cat-back exhaust plus test pipe Greddy Profec B spec 2 boost controller HKS type 1 turbo timer Supra sport solid steel drive shaft Walboro 255 fuel pump JZA70 Front end mod 18" Volk Racing AV3 18x8.5 front 18x9.5 rear

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07-11-2007, 10:31 PM	#2
supramacist 1000whp postwhore Join Date: Apr 2007 Location: Escape from the Prison Planet Posts: 1,356	Have ya check'd the codes Daddy-O ??? The codes will tell you exactlly what you need to do. It sounds like the afm. But hell. It could be a few things.

07-12-2007, 10:53 AM	#3
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	There is also a ground on the lower intake manifold. It's brown and white wires going to 1 ring terminal that bolts to the lower intake manifold. Did you check the ignition timing? Whats it at?

07-12-2007, 01:59 PM	#5
Supra chick's dad Stock Join Date: Jul 2007 Location: Colorado Posts: 13	Ok, timing I have not checked and compression or vacuum either. I will. Dang the thing runs so smooth at idle, like a new car should. Also starts right up, not like retarded or advanced timing, or low compression. And the cam sensor wasn't moved during the engine swap. Contacts inside have correct air gap. I took the hose off at the throttle body to eliminate any possible restrictions in the air supply, no difference. I am thinking it has to be either blocked exhaust since it has weak pressure at the tailpipe or low fuel volume or just a bad ECU. It ran fine before the previous owner ran it dry. Sat for 2 years then got a used (Under 50K) motor. I drained the fuel lines and tank and put in fresh fuel too. New spark plugs also.

07-14-2007, 07:49 AM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Okay, first off where in CO are you? Second, test the TPS per the instructions detailed in the TSRM: http://www.cygnusx1.net/Supra/Librar...spx?S=FI&P=101 EDIT: Oh, and I've seen 7M's idle smooth as silk even with the timing off by 15?. Mine. It's part of the beauty of an inline 6.