stalling under load

marxdenning · 01-18-2007, 03:28 PM

Hi,

I have the 1990 supra turbo 7mgte and i'm experiencing problems with idle/stalling. If i start the car it is fine and ticks over at 700 to 1000rpm, if I am doing a constant speed or decelerating then drop the clutch it is fine. However if i accelerate then drop the clutch the revs will momentarily drop to about 400 or stall, even if it has only gone from e.g. 1 to 2mph or 40 to 41mph. I do not have to put the pedal to the floor for this to happen, only enough for acceleration. It has been an ongoing problem for many years now and i have replaced several parts which include: egr valve and the other brown coloured valve it connects to, afm, replaced the idle valve with a secondhand one, fpr, o2 sensor, ecu was tested, turbo, sparkplugs, cleaned the three coils, ht leads, full exhaust system, had the injectors pressure tested, air filter, gearbox, checked several times for air leaks with no joy, it had an engine rebuild (not the rings) including the head and block being skimmed a few years back but all of these items were after this problem arose. I am at a loss and could really do with some help from the experts on this one.

Many Thanks
Marc

IHateHacks · 01-18-2007, 09:51 PM

What's your fuel pressure at? I see you tested or replaced a bunch of items, I'm sure you tested the fuel pressure right? If not, I'd start there.

Have you ever replaced the fuel filter? I didn't see that listed. They should be (and I emphasize SHOULD) replaced every year or 12,000 miles.

You said you cleaned the coil packs but have you checked them with a volt/ohm meter? Thats the only way to tell if they are operating correctly. Same with the plug wires.

01-18-2007, 03:28 PM	#1
marxdenning Stock Join Date: Jan 2007 Location: Southampton - England Posts: 1	stalling under load Hi, I have the 1990 supra turbo 7mgte and i'm experiencing problems with idle/stalling. If i start the car it is fine and ticks over at 700 to 1000rpm, if I am doing a constant speed or decelerating then drop the clutch it is fine. However if i accelerate then drop the clutch the revs will momentarily drop to about 400 or stall, even if it has only gone from e.g. 1 to 2mph or 40 to 41mph. I do not have to put the pedal to the floor for this to happen, only enough for acceleration. It has been an ongoing problem for many years now and i have replaced several parts which include: egr valve and the other brown coloured valve it connects to, afm, replaced the idle valve with a secondhand one, fpr, o2 sensor, ecu was tested, turbo, sparkplugs, cleaned the three coils, ht leads, full exhaust system, had the injectors pressure tested, air filter, gearbox, checked several times for air leaks with no joy, it had an engine rebuild (not the rings) including the head and block being skimmed a few years back but all of these items were after this problem arose. I am at a loss and could really do with some help from the experts on this one. Many Thanks Marc Last edited by marxdenning; 01-18-2007 at 03:31 PM.

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01-18-2007, 09:51 PM	#2
IHateHacks 20psi boost Join Date: May 2006 Location: New Haven/Hamden Posts: 793	What's your fuel pressure at? I see you tested or replaced a bunch of items, I'm sure you tested the fuel pressure right? If not, I'd start there. Have you ever replaced the fuel filter? I didn't see that listed. They should be (and I emphasize SHOULD) replaced every year or 12,000 miles. You said you cleaned the coil packs but have you checked them with a volt/ohm meter? Thats the only way to tell if they are operating correctly. Same with the plug wires.