Help, no power....

Supra chick's dad · 07-11-2007, 07:01 PM

Hey first post here but read a bunch. I put a used Jap motor in my daughter's 89 Turbo Supra as the previous owner han the original out of oil. It all went in real well, and starts right up and idles nicely. However when you touch the gas pedal the rpm drops to 500 rpm's and wants to die. If you let up it returns to a smooth 800rpm's. Cannot possibly get it to rev at all. Here is what I've checked. MAF, TPS, O2, MAP, all connections on the engine harness for bad connections and every pin and socket behind the glove box. Here is what I have noticed, exhaust feels a bit weak at the exhaust tip. I can hold it back without any change in rpm and it doesn't seem to build up a lot of pressure. Small electrical zap when I turn off the ignition and put my hand oth the rocker panel as I get out of the car. This pulse is almost everytime.
Any ideas would be appreciated.....

88Tsupra · 07-11-2007, 07:56 PM

when u say electrical zap..im asuming you can actually feel it have you check all your ground wire then..

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?

07-11-2007, 07:01 PM	#1
Supra chick's dad Stock Join Date: Jul 2007 Location: Colorado Posts: 13	Help, no power.... Hey first post here but read a bunch. I put a used Jap motor in my daughter's 89 Turbo Supra as the previous owner han the original out of oil. It all went in real well, and starts right up and idles nicely. However when you touch the gas pedal the rpm drops to 500 rpm's and wants to die. If you let up it returns to a smooth 800rpm's. Cannot possibly get it to rev at all. Here is what I've checked. MAF, TPS, O2, MAP, all connections on the engine harness for bad connections and every pin and socket behind the glove box. Here is what I have noticed, exhaust feels a bit weak at the exhaust tip. I can hold it back without any change in rpm and it doesn't seem to build up a lot of pressure. Small electrical zap when I turn off the ignition and put my hand oth the rocker panel as I get out of the car. This pulse is almost everytime. Any ideas would be appreciated.....

07-11-2007, 07:56 PM	#2
88Tsupra 12psi boost Join Date: Jan 2007 Location: long beach, CA Posts: 252	when u say electrical zap..im asuming you can actually feel it have you check all your ground wire then.. __________________ 88turbo targa-white original Pin Stripe custom intake-Tenzo filter.....Momo racing seats and steering wheel... apexi exhaust tip-custom 3" piping. Replaced with RSR GT II NGK plug and wires HID conversion head lights HKS Turbo Timer Type-1 (in black) Tial BOV BIC DDP

07-11-2007, 08:02 PM	#3
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	#6
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.

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07-11-2007, 10:31 PM	#4
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	#5
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?