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Old 07-06-2008, 05:32 AM   #1
carfanatic89
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Default Car wont start hot

87 7mge manual.
Ive been trying to find out whats wrong with my car for the last 6 months.
When my car is cold it starts easy and runs fine, till I get somewhere. Ill kill it, when I come back to it after sitting 20 mins and the engines still hot it will turn over but wont start. If im lucky I can get it to but it spits and sputters for about 4 miles then clears out. The funny thing is when its running after a cold start the engine cant take full throttle pretty much falling on its face, but once the engine warms up its fast as hell. I cannot find the problem anywhere.

I have tested just about everything in the car and everthing so far checks out. I just did a diagnosis on it and im comming up with 51. If it was the neutral start switch the starter wouldnt even try to start the car. I replaced the o2 sensor, TPS, pickup coils in the dis., wires, plugs, coil, fuel pump, FPR, fuel filter, air filter, and battery cables. I also replaced the grounding straps from the trany to frame, and engine to frame. and I cleaned the grounds comming from the bat. ground to the frame.

I also took a ohm meter to these, MAF, control modual and I also check the wires going from the ecu to the, tps, maf, control modual, o2, and injectors.

Nothing is wrong with this damn thing so why doesnt it want to start when hot. All the hillbilly mechanics around here know nothing about supras. I just want my supra fixed. please help me
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Old 07-06-2008, 06:05 AM   #2
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when it cranks but wont start, check for spark, if you're getting none, you know where to go from there. If you are, check fuel. Most of the engine is mechanically in sync, so if it is getting spark at the right time, and is getting fuel, it should run.
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Old 07-07-2008, 04:51 AM   #3
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Sound like a fuel problem. Toyota had a real 'hot hard start' problem back then. The intake valves get very carboned up. Read and do this first. http://www.toyota-supra.info/forums/...injectors.html

It may fix your problem, and certainly is good for your engine.

You MAY have an electrical component that has a bad spot in it that is effected by a hot underhood soak (parking for a while, then trying to start engine). You will have to test parts and 'catch it' in the act.
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Old 07-20-2008, 03:49 PM   #4
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I might have found the problem I did the injector cleaner and carb cleaner in the intake, but it was still messing up so I started to pull the wires and plugs to take a look at them, see if the plugs revealed anything.

Everthing checked out till I got to the last two plugs. The spark plug wells where half filled with oil???? My valve cover gaskets are leaking AGAIN.

I replaced them about 8 months ago and stopped the leak. When they leaked last time it didnt cause my car to mess up, but I knew it would eventually so I replaced them and checked it every week for about 2 months with no signs of a leak. Im sure the day after the last time I checked it, it started leaking again. lol I hope this is it.

Oh and I had one other Q. When you adj the tps, do you set it based on how the engine runs or on ohm resistance. thanks
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Old 07-21-2008, 09:30 AM   #5
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Set the TPS off of the resistance as stated in the TSRM
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Old 07-29-2008, 05:29 PM   #6
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Im really close to giving up on the supra, I got it back together and she's still messed up. I fixed the hot start thing. At idle it purrs like a kitten. If you gently press the throttle it will rev up and rev down like normal, but on the rev down if you give it gas to rev back up (like if you where shifting) it missfires and feel like the motor is boged down. If I give it full throttle, It acts like you turned the key off and wont rev up at all. The RPM needle just falls all the way to 0. (dies) A gentle throttle has more of a pull then full throttle. I dont know what to do know.
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Old 08-18-2008, 03:10 AM   #7
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I took it for a trip about 500 miles. It ran great going there but on the way back it started running bad. When at a stop it idles at 500 rpm, flutters up and down till it dies.
Yeah and its not starting when its hot. Again. I smell fuel when I try to start it, but the spark plugs are white like its running lean. The car runs good when cold and bad when hot. I cant give it full throttle at all or it will start missing.
I looked around on the internet and nobody has a full proof solution to this problem.
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Old 08-18-2008, 05:45 AM   #8
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Have you cheked your IC piping for leaks?
Try diagnosting the TPS sensor as well. The procedures are in the TSRM.
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Old 08-21-2008, 11:36 PM   #9
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Im not running a intercooler. The 1st thread posted tells what I have tested.
Im going to a tech school right now, and my instructor told me it sound like my ecu is missing up.
Im going to run a ohm meter over all the terminals again to see what I find, but its too damn hot to be working on my car in the parking lot.
100+ allmost everyday. lol but I'll keep yall posted on what I find.

Im just wondering, what size battery does a 7mge need.
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Old 08-22-2008, 11:47 AM   #10
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I had a very similar problem with my 87 N/A. I figured out it was my spark plug wire boot not being all the way 'snapped' onto the sparkplug. Made a slight adjustment and fixed my problem.
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