Supra slow to pick up power

downunder · 03-02-2011, 04:12 AM

Hi

I am wondering if anyone might have any ideas on this problem that has developed with my 87 MA 70 Twin Turbo. One owner.

Had local mechanic look at it who has done good work on this car before and he cannot find the problem.

He has checked things like fuel and air filters, cylinder compressions, intercooler and the pressurizations, changed plugs, checked timing etc.

Problem is – it lacks power up to around 3000rpm.
It seems to nearly reach around 3000rpm when the first turbo I think should be cutting in but then the revs drop to around 2500. When the turbo does cut in at around 3-3500 there is plenty of power. To me its like the automatic transmission is not going the gears smoothly like it did before.

Any help would be most appreciated

cre · 03-02-2011, 05:58 AM

If it's an MA70 (or an MA71; look at your VIN and let us know which) then that's not the stock engine, in which case... who only knows the limit of possible problems.... well, I do and I'm sure many others here do too, but I think you get the point. What model engine is in the car?

Travis89Turbo · 03-02-2011, 05:53 PM

Twin turbo? Sounds like possibly a jz. Post a pic if your unsure

If it is 1j. I have a few ideas! (common prob. with coils)

downunder · 03-02-2011, 09:49 PM

Model Number is
E-GA70-BJPVZ

Engine
1G-GTEV 1988

downunder · 03-02-2011, 10:37 PM

Further driving the car yesterday ---- symptoms seems like

(a) automatic could be missing a lower gear ..it get up to around 3000rpm then sometimes quite forcibly changes gear and drops back to around 2500 then is slow to pick up to when the turbo pulls in
(b) but then it also feels like it could be some sort of fuel or electrical problem because on hill starts at lights it tries to pick up power and slowly does but is stunted in its pulling power again to around 3500 then the car goes fine.

Coil is something I have not considered mentioned within the forum

cre · 03-02-2011, 11:10 PM

Unfortunately the 1G is a rare bird. It, like the 1JZ never saw North America but unlike the 1JZ it is not a popular engine. This site has become largely USDM and CDM centric and the resources you will find here are limited; I suggest trying UK, AUS and NZ based forums as the vehicle did make it to those markets (even if just as a grey market import). Perhaps BillUK may know of some resources for these.

Things I would start with checking are: diagnostic codes stored in the ECU, timing, air flow meter (isn't that a MAP based system?), speed sensor, igniter and coils, intake plumbing for leaks... then I'd start in on the transmission.

downunder · 03-02-2011, 11:39 PM

Thank you, I will try the forums and the check list mentioned
I think it is a MAP based system
Mechanic did check out codes earlier

Bill UK · 03-02-2011, 11:49 PM

A few in the UK, but not active on the Supra forums for many years, try Australia and New Zealand
http://www.supraforums.com.au/forum/showthread.php/24434-Rob-s-1GGTE-HG-rebuild

03-02-2011, 04:12 AM	#1
downunder Stock Join Date: Mar 2011 Location: Gold Coast Posts: 4	Supra slow to pick up power Hi I am wondering if anyone might have any ideas on this problem that has developed with my 87 MA 70 Twin Turbo. One owner. Had local mechanic look at it who has done good work on this car before and he cannot find the problem. He has checked things like fuel and air filters, cylinder compressions, intercooler and the pressurizations, changed plugs, checked timing etc. Problem is – it lacks power up to around 3000rpm. It seems to nearly reach around 3000rpm when the first turbo I think should be cutting in but then the revs drop to around 2500. When the turbo does cut in at around 3-3500 there is plenty of power. To me its like the automatic transmission is not going the gears smoothly like it did before. Any help would be most appreciated

03-02-2011, 05:58 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	If it's an MA70 (or an MA71; look at your VIN and let us know which) then that's not the stock engine, in which case... who only knows the limit of possible problems.... well, I do and I'm sure many others here do too, but I think you get the point. What model engine is in the car? __________________ 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 --->

03-02-2011, 05:53 PM	#3
Travis89Turbo 12psi boost Join Date: Jul 2010 Location: Utah Posts: 332	Twin turbo? Sounds like possibly a jz. Post a pic if your unsure If it is 1j. I have a few ideas! (common prob. with coils) __________________ 1995 Toyota Supra SE 71k miles. Master power T70 stock 2jzge 1989 Toyota Supra. 1jzgte swap 5 speed of course.. Driftmotion 60-1 single turbo kit. Cxracing FMIC. 2jz 550cc injectors... soon to come..... EMS Stinger. BC 264 cams 680cc injectors Spec stage 4 clutch and A LOT of boost!------SOLD 1999 Ford F350 diesel 2004 Jaguar XJR Supercharged If it hasnt broke you haven pushed it hard enough!!

03-02-2011, 09:49 PM	#4
downunder Stock Join Date: Mar 2011 Location: Gold Coast Posts: 4	Supra slow to pick up power Model Number is E-GA70-BJPVZ Engine 1G-GTEV 1988

03-02-2011, 10:37 PM	#5
downunder Stock Join Date: Mar 2011 Location: Gold Coast Posts: 4	Supra slow to pick up power Further driving the car yesterday ---- symptoms seems like (a) automatic could be missing a lower gear ..it get up to around 3000rpm then sometimes quite forcibly changes gear and drops back to around 2500 then is slow to pick up to when the turbo pulls in (b) but then it also feels like it could be some sort of fuel or electrical problem because on hill starts at lights it tries to pick up power and slowly does but is stunted in its pulling power again to around 3500 then the car goes fine. Coil is something I have not considered mentioned within the forum

03-02-2011, 11:10 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Unfortunately the 1G is a rare bird. It, like the 1JZ never saw North America but unlike the 1JZ it is not a popular engine. This site has become largely USDM and CDM centric and the resources you will find here are limited; I suggest trying UK, AUS and NZ based forums as the vehicle did make it to those markets (even if just as a grey market import). Perhaps BillUK may know of some resources for these. Things I would start with checking are: diagnostic codes stored in the ECU, timing, air flow meter (isn't that a MAP based system?), speed sensor, igniter and coils, intake plumbing for leaks... then I'd start in on the transmission. __________________ 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 --->

03-02-2011, 11:39 PM	#7
downunder Stock Join Date: Mar 2011 Location: Gold Coast Posts: 4	Supra slow to pick up power Thank you, I will try the forums and the check list mentioned I think it is a MAP based system Mechanic did check out codes earlier

03-02-2011, 11:49 PM	#8
Bill UK AEM EMS Join Date: Jul 2006 Location: UK Posts: 891	A few in the UK, but not active on the Supra forums for many years, try Australia and New Zealand http://www.supraforums.com.au/forum/showthread.php/24434-Rob-s-1GGTE-HG-rebuild

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