Weirdest Non-Starting Problem

GCPRO · 11-04-2005, 03:02 PM

I could not find this problem reported in another thread. It has been plaguing me for years now. Any ideas would be appreciated.

Problem:

Car randomly will not start

Vehicle info

1990 Supra with 7MGE JDM engine replacement 3 yr ago
T-top
Viper alarm

Symptoms

Not related to humidity, temp, engine temp, etc.
Flicking key repeatedly sometimes gets it to proceed
Leaving car unlocked seems to make a difference
Not using Viper (use old style key in door to lock/unlock) seems to improve things

What’s been tried

Replaced starter motor 2 times over last couple of years. Another one (Bosch this time) is going in this weekend (not expecting it to make a difference)
Replaced battery
Battery power and ground cables replaced
Ignition switch and tumbler replaced
Replaced relay supplying V to starter solenoid

My intuition is that the Toyota theft deterrent system is disallowing it to start, although I am not sure how to test/fix this. I got frustrated trying to follow the aftermarket Viper wiring installation and gave up.

Anyone else see such weirdness? Any ideas?

11-04-2005, 03:02 PM	#1
GCPRO Stock Join Date: Nov 2005 Posts: 4	Weirdest Non-Starting Problem I could not find this problem reported in another thread. It has been plaguing me for years now. Any ideas would be appreciated. Problem: Car randomly will not start Vehicle info 1990 Supra with 7MGE JDM engine replacement 3 yr ago T-top Viper alarm Symptoms Not related to humidity, temp, engine temp, etc. Flicking key repeatedly sometimes gets it to proceed Leaving car unlocked seems to make a difference Not using Viper (use old style key in door to lock/unlock) seems to improve things What’s been tried Replaced starter motor 2 times over last couple of years. Another one (Bosch this time) is going in this weekend (not expecting it to make a difference) Replaced battery Battery power and ground cables replaced Ignition switch and tumbler replaced Replaced relay supplying V to starter solenoid My intuition is that the Toyota theft deterrent system is disallowing it to start, although I am not sure how to test/fix this. I got frustrated trying to follow the aftermarket Viper wiring installation and gave up. Anyone else see such weirdness? Any ideas?