Originally Posted by Yamae

Have you read this at the post #1?
● random not starting or cutting out.

QAS capacitors seldom last for 30 years and it is the often case that copper traces are damaged.

Originally Posted by sigtwenty

Question, is there any way the ECU capacitor issue can cause a car to not start only when its warmed up?
its an extremely specific and constant re-occuring issue. car starts fine when cold/cooled down, but when its at operating temp, it will not restart, only the relay clicks rapidly.

car itself has new starter, coils, plugs, wires, timing belt job, fuel pump and fuel filter, replaced starter relay, battery new, car does run and drive fine, it did have a slight rough idle after all the new stuff was replaced, however i did also replace the coolant temp sensor (the 2 wire one that sends readings to the ECU) and the car does run better now...but the starting issue remains....replaced it thinking that one communicates to the ecu and prevents the starter from engaging....but, it was not successful in that.

the starting issue was going on before all the new parts....so nothing new or any work done has solved this problem.....

however, on a long drive, my cluster was flipping out (which this car has never done before), lights going blank and such flickering all over the place and when the backlights went out warning lighs appeared, and the when lights came back warning lights went away...and felt a random very slight cut out after 30 min of highway driving...i did remove the ECU and opened it, and found only one capacitor small leak that was along the fuel injection lines of the board which explains the weird cutting out driving experience...but the rest of the board is clean...
while yes another capacitor can be the issue without a leak as detailed in this sticky thread, is there any chance another capacitor being weak causing these cars to not start under this specific condition?

i know the ECU needs to be redone because of the other capacitor, but before i spend the money i want to fix this weird no start issue, or confirm that the ECU can actually cause this otherwise ill just be dumping more money into this car and all for nothing.

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Originally Posted by williamb82

Most likely it is the starter itself. I have had this exact same issue on my 93 LS400. It was the contacts in the starter. Cheap to replace but a lil bit of a PITA as the starter is under the intake manifold.

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