The unfixable mystery problem

*Deadman* · 08-16-2009, 06:37 AM

Could it be the box?

GettaRobo · 08-16-2009, 06:43 AM

Good suggestion, but I'm thinking if the engine won't even rev past 5200 RPM that it probably isn't it. I forgot to add that when you leave it floored for a bit you can begin to smell raw fuel when the windows are down.

*Deadman* · 08-16-2009, 08:09 AM

what about a leaky injecter or a crack in the manifold

Im just throwing out ideas see if anyone clicks

btwilson86 · 08-16-2009, 09:40 AM

It sounds to me that the air entering the engine is not being metered properly. I haven't seen much discussion of the possibility of a bad mass air flow sensor in this thread. If the sensor is bad, or if the wiring has been reconnected improperly, your computer will not be receiving an accurate measure of air and will not add the proper mix of fuel, therefore resulting in a loss of power (stopping you from increasing your rpm's with various loads). Note that you will still be able to rev in neutral or park as there is virtually no load on the engine, thus requiring little power to rev.

I tried finding a pinout of a N/A mass air flow sensor, but have failed in the search. Colored wires should be the same on similar year supras, so you might be able to cross reference that way. I say swap your Canadian MAF for your CA one and see if that helps.

GettaRobo · 08-17-2009, 02:16 AM

So I took a look at the wiring, and this is what I found.

The camera wouldn't really focus properly, but the yellow wire is bare at the beginning of the connector in this pic :

Click image for larger version

Name: DSC00300.JPG
Views: 506
Size: 85.0 KB
ID: 2234

In this one, it shows two brown wires spliced into one. I'm wondering if this might be the issue:

Click image for larger version

Name: DSC00306.JPG
Views: 489
Size: 58.9 KB
ID: 2235

Let me know what you guys think. I may be able to pull off the harness from my other car to fix it. Also, the maf was bad on this car so I have one from the US now that I got off of ebay. Both run fine on my parts car.

*Deadman* · 08-17-2009, 03:18 AM

Yea that looks a little dodgy man if you really want to you could change the looms or take it down to an auto sparky and get them to have a look

btwilson86 · 08-17-2009, 06:00 AM

Yeah, I would check the wiring on your parts car's MAF sensor plug. Wire colors will probably be the same, and if so I would cut the connector off of it and splice it onto the Supra you're trying to get running. I'm pretty sure those 2 wires shouldn't be spliced together, but I can't say for sure as I don't have a N/A that I can easily go check the wiring on...

Hopefully that's your problem though. Would like to see this thread end with "I got the car running" sometime soon...

08-16-2009, 06:37 AM	#1
Deadman Stock Join Date: Jul 2009 Location: Christchurch Posts: 12	Could it be the box? __________________ "88 Turbo A 150xxx ks Stock (Wreaked) "86.5 widebody shell aero top factory manual Soon to come 86.5 with 7mgteu and r154 aerotop w/ leather seats

08-16-2009, 08:09 AM	#3
Deadman Stock Join Date: Jul 2009 Location: Christchurch Posts: 12	what about a leaky injecter or a crack in the manifold Im just throwing out ideas see if anyone clicks __________________ "88 Turbo A 150xxx ks Stock (Wreaked) "86.5 widebody shell aero top factory manual Soon to come 86.5 with 7mgteu and r154 aerotop w/ leather seats

08-16-2009, 09:40 AM	#4
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	It sounds to me that the air entering the engine is not being metered properly. I haven't seen much discussion of the possibility of a bad mass air flow sensor in this thread. If the sensor is bad, or if the wiring has been reconnected improperly, your computer will not be receiving an accurate measure of air and will not add the proper mix of fuel, therefore resulting in a loss of power (stopping you from increasing your rpm's with various loads). Note that you will still be able to rev in neutral or park as there is virtually no load on the engine, thus requiring little power to rev. I tried finding a pinout of a N/A mass air flow sensor, but have failed in the search. Colored wires should be the same on similar year supras, so you might be able to cross reference that way. I say swap your Canadian MAF for your CA one and see if that helps. __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

08-17-2009, 02:16 AM	#5
GettaRobo 3" Exhaust Join Date: Apr 2009 Location: Saskatoon, SK Posts: 65	So I took a look at the wiring, and this is what I found. The camera wouldn't really focus properly, but the yellow wire is bare at the beginning of the connector in this pic : In this one, it shows two brown wires spliced into one. I'm wondering if this might be the issue: Let me know what you guys think. I may be able to pull off the harness from my other car to fix it. Also, the maf was bad on this car so I have one from the US now that I got off of ebay. Both run fine on my parts car. Last edited by GettaRobo; 08-17-2009 at 02:19 AM.

08-17-2009, 03:18 AM	#6
Deadman Stock Join Date: Jul 2009 Location: Christchurch Posts: 12	Yea that looks a little dodgy man if you really want to you could change the looms or take it down to an auto sparky and get them to have a look __________________ "88 Turbo A 150xxx ks Stock (Wreaked) "86.5 widebody shell aero top factory manual Soon to come 86.5 with 7mgteu and r154 aerotop w/ leather seats

08-16-2009, 06:43 AM	#2
GettaRobo 3" Exhaust Join Date: Apr 2009 Location: Saskatoon, SK Posts: 65	Good suggestion, but I'm thinking if the engine won't even rev past 5200 RPM that it probably isn't it. I forgot to add that when you leave it floored for a bit you can begin to smell raw fuel when the windows are down.

08-17-2009, 06:00 AM	#7
btwilson86 Super Moderator Join Date: May 2007 Location: Billings, Montana Posts: 1,034	Yeah, I would check the wiring on your parts car's MAF sensor plug. Wire colors will probably be the same, and if so I would cut the connector off of it and splice it onto the Supra you're trying to get running. I'm pretty sure those 2 wires shouldn't be spliced together, but I can't say for sure as I don't have a N/A that I can easily go check the wiring on... Hopefully that's your problem though. Would like to see this thread end with "I got the car running" sometime soon... __________________ 1989 7MGTE R154 Targa Top White Package w/Blue Interior Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ABS Problem?	rasclaat_98	MKIII Supra	6	12-13-2010 09:53 PM
speed sensor problem	nadircicek	Non-Generation Specific Questions	8	10-09-2009 05:58 PM
another heater problem	nicnet	MKIII Supra	16	12-05-2007 10:18 PM
found the problem	brs86supra	MKIII Supra	0	05-02-2006 03:42 PM
Boost Problem, I Guess	nonstop213	MKIII Supra	0	02-23-2006 07:32 PM