kohatsu

Need some help! The driver side plugs all 4 has no spark. Changed coils, plugs, wires, cam shaft sensor. I'm thinking of replacing distributor cap and rotor, and I heard the crank shaft position sensor? anybody faced this problem before. Car is basically running on 4 cylinders. Did compression tests and all ok with that. car is a 92. Mechanic says that there is spark from the coil to the distributor, but no spark coming out of the plugs. Any Advice. Thanks

sha4000

iTrader: (1)

That's pretty self explanatory if you ask me. Give it a go and let us know so we can advise. What codes do you get on the check engine light?

kohatsu

ok ill keep u updated thanks

Yamae

Sounds like a power transistor in the ignition unit is causing the minor internal leak. Or the clamp diode in parallel with the transistor is doing so. In these cases, the arcing occurs at the ambient but not at the compressed air in the cylinder.

PureDrifter

iTrader: (10)

no spark at plugs--> distributor issue, unless he wasn't getting spark in the cylinder but did when the plugs were pulled.

python

iTrader: (4)

ignitor? btw u probably wont get a cel on

Yamae

A minor leakage of semiconductors can't be detected by the ECU. The minor leakage also makes it possible to spark for a few milli meter at 1 ATM.

python

iTrader: (4)

im def. not going to dispute what ur saying yamae. do a ripple test, ive never heard of the ecu causing only 1 bank to not fire..especially in a pre obd2 car..doesn't mean anything other than ive yet to hear of it.

next:it cant be the distributor cap or rotor..each distributor is related to both banks. this was already covered previously by another member having a similar issue.

Yamae

I am not saying any about the ripple nor the ECU here. Do you know what is the leakage of electrons?

python

iTrader: (4)

lol..obviously not. I misread ur post..sorry

kohatsu

Ok guys this is what was the test results. Distributer is good, There is spark at the wires. but no spark in the cylinder. Mechanic did all the checks and compressions is good on all cylinders. He is saying it might be electrical, like something is shorting out. Im thinking of taking it to a shop that specializes in electrical work. Any advice?

kohatsu

oh yah all driver side cylinders still no spark.

kohatsu

another thing when they tried to pull codes, they couldn't get any codes to come up. Do u think definitely ecu?

python

iTrader: (4)

makes no sense...ur getting spark from the cap to the wires..no spark from the wires to the plugs?

Yamae

It only makes sense when the secondary voltage is not high enough. It requires only 1kV to travel electrons for a 1mm gap at ambient. But in the compressed air such as at 10 ATM, more than 10 kV is needed to have a good spark. Did you check the leakage?