Car dies for no reason!!!!!!

[gearhead789]

I have a 1990 MKIII turbo 5-speed. I've replaced the fuel filter, pump, plugs, air filter. I've replaced the throttle position sensor, and cleaned the intake. I will be driving for 5 minutes to up to 1 hour and then for no apparent reason whatsoever the car dies. It will start to sputter, lose rpm's, then I start smelling un-burned fuel and as soon as I take my foot off of the clutch the thing dies completely and won't start back up until I let it sit for about 5 mins. This has done this about 5 times in the past week, I'm lost someone please give me some suggestions.

Thanks

[Jeeves]

Try jiggling the wires around the cam position sensor. It's a long shot and the symptoms don't match, but it's often a cause of sparatic dying.

[88SupraMKIII]

I had a similar problem with my 88 N/A. It didn't do it as much as yours. Mine died twice on me, the first time it started back up but the second time it didn't. I thought the same thing that you did. Checked fuel pressure, checked spark, checked air....turns out it was as simple as the Rotor just got totally burned out. Don't know if it's the same as yours but it's a thought.

[Jeeves]

The turbo models use a coil pack ignition system and not a distributor, so there's no rotor to burn up.

[88SupraMKIII]

ahhhh...gotcha. then totally forget what I just said.

[gearhead789]

thanks for all the replies, i'm going to try ohming out my coil pack, I have another one also, I'll try that one too, I'm lost after that though.

[Krypto]

The wires going to your Cam Position Sensor have gotten either corrded or broken inside. This is a very common issue in the MKIII Turbo's. Double check all the connections...place some electrical grease within the connectors and make sure they're making proper connection.

Kruso

[shockel]

Don't these cars have a self diagonsis on the computer? If so try it.

[Krypto]

Short out the E1 and the T1 pin under the diagnostics box and the code will give you a pretty good idea asto what it it is. But unfortunately in his case he'll be lucky to find any codes in the ECU. Its rare to find a code with this issue.

Kruso

[mblnnash]

Greetings,


Your problem is a relay....
Check the codes that are generated, and then follow the step by step troubleshooting procedures. If it sets many sensor codes, I would suspect the ignition relay (Main EFI Relay).

You should probably clear all codes, then drive the car to failure; a fresh set of codes may prevent you from chasing unrelated issues.

Keep in mind, relays may seem to work while testing, but with eroded / worn contacts, can fail when you hit a bump, or at a certain temperature. Don't trust the fact that a relay tests good, since you can't mimic its operating conditions.

Good luck,

[Jeeves]

Shockel,
These cars are OBDI, not OBDII. Jumping those pins does flash the codes at you, but they're almost worthless for issues like this.

[mblnnash]

OBD1 codes are quite useful to someone who knows how to use them. Especially if it is all you have to work with. I have resolved a many issues with information supplied via ODB1 computers.


Cheer up,

[Krypto]

Jeeves is correct in this matter. These codes will NOT register for your problem. MBLNNASH, I constantly use these codes to keep my manitaned and problem free. On these cars checking codes for that problem wont do him any good.

Kruso

[repinS]

If the Supras are like the 89-92 Cressidas, they're not exactly even OBD1. Some OBD stuff, and some proprietary Toyota stuff.

[mblnnash]

Kruso,


Perhaps Toyota put them there for no reason?
I don't remember any of the instructors mentioning "codes are of no help" in any of the Toyota certification classes I attended.
Perhaps you did...