Need help with stalling issues

toyomr2 · 06-29-2009, 09:47 PM

I just purchased a 88 Supercharged MR2, I'm new to MR2's but been around turbo and supercharged vehicles, figure before I spend any money on parts I'll ask for help here. Ok, the problem is that the car will start and run normal for about 20 seconds and stall (like someone turned the key off), it will not start until about 5 min. later or sometimes does not want to start at all, I've traced the problem that it is loosing spark, I've replaced the coil but still same problem, it has new plugs, cap,rotor and wires, any help would greatly be appreciated.

palos · 06-29-2009, 10:33 PM

Isolating the problem to the ignition circuit basically leaves the fusible link in the positive battery cable, the ignition switch itself, engine main relay and then the ecu.

If other accessories are functional, i.e. radio, fan, etc…, after the engine stalls, then I would investigate the engine main relay, which I believe is just left of the battery. You should be able to open it up and check/clean the contacts.

My initial thought was the fuel circuitry.

At your favorite dealership, or on-line, the factory service manual is highly recommended and is affectionately known as the Big Green Book (BGB).

toyomr2 · 06-29-2009, 11:01 PM

Ok, thanks, yeah, everything stays on just engine cuts off, I'll look into the engine main relay tomorrow(fingers crossed) the car runs great when it runs for the first 20 seconds

muffinman · 06-30-2009, 09:31 AM

download the BGB it has alot of good information
Free File Hosting Made Simple - MediaFire

toyomr2 · 06-30-2009, 09:33 PM

Looks like I have bigger issues, the car has no fuel or spark now! And check engine light is not "ON" anymore, wondering if my ECU is the problem, guess I'll do some tests tomorrow and find out more hopefully

palos · 07-01-2009, 12:26 AM

If you have obtained a copy of the BGB, read the diagnostic codes, if any.

toyomr2 · 07-01-2009, 03:32 PM

Thanks palos! It ended up being the main EFI relay not making good contact, car runs again with no stalling, also, thanks muffinman for the BGB link, it helped quite a bit.

06-29-2009, 09:47 PM	#1 (permalink)
toyomr2 No Skills Join Date: Jun 2009 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Need help with stalling issues I just purchased a 88 Supercharged MR2, I'm new to MR2's but been around turbo and supercharged vehicles, figure before I spend any money on parts I'll ask for help here. Ok, the problem is that the car will start and run normal for about 20 seconds and stall (like someone turned the key off), it will not start until about 5 min. later or sometimes does not want to start at all, I've traced the problem that it is loosing spark, I've replaced the coil but still same problem, it has new plugs, cap,rotor and wires, any help would greatly be appreciated.

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06-29-2009, 10:33 PM	#2 (permalink)
palos … Join Date: Apr 2009 Posts: 170 Thanks: 0 Thanked 20 Times in 18 Posts iTrader Rating: (0/0% )	Isolating the problem to the ignition circuit basically leaves the fusible link in the positive battery cable, the ignition switch itself, engine main relay and then the ecu. If other accessories are functional, i.e. radio, fan, etc…, after the engine stalls, then I would investigate the engine main relay, which I believe is just left of the battery. You should be able to open it up and check/clean the contacts. My initial thought was the fuel circuitry. At your favorite dealership, or on-line, the factory service manual is highly recommended and is affectionately known as the Big Green Book (BGB).

06-29-2009, 11:01 PM	#3 (permalink)
toyomr2 No Skills Join Date: Jun 2009 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Ok, thanks, yeah, everything stays on just engine cuts off, I'll look into the engine main relay tomorrow(fingers crossed) the car runs great when it runs for the first 20 seconds

06-30-2009, 09:31 AM	#4 (permalink)
muffinman Brain Surgeon Join Date: Jan 2008 Location: Ft. Lauderdale Posts: 1,752 Thanks: 24 Thanked 100 Times in 98 Posts My Google Map iTrader Rating: (1/100% )	download the BGB it has alot of good information Free File Hosting Made Simple - MediaFire

06-30-2009, 09:33 PM	#5 (permalink)
toyomr2 No Skills Join Date: Jun 2009 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Looks like I have bigger issues, the car has no fuel or spark now! And check engine light is not "ON" anymore, wondering if my ECU is the problem, guess I'll do some tests tomorrow and find out more hopefully

07-01-2009, 12:26 AM	#6 (permalink)
palos … Join Date: Apr 2009 Posts: 170 Thanks: 0 Thanked 20 Times in 18 Posts iTrader Rating: (0/0% )	If you have obtained a copy of the BGB, read the diagnostic codes, if any.

07-01-2009, 03:32 PM	#7 (permalink)
toyomr2 No Skills Join Date: Jun 2009 Posts: 4 Thanks: 2 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Thanks palos! It ended up being the main EFI relay not making good contact, car runs again with no stalling, also, thanks muffinman for the BGB link, it helped quite a bit.