siscogts

maybe I skip the right post, CPS wirings connectors?
Francesco

PS: it could be also the ECU

Mongo

Any way you can borrow an LH just to see if the problem still persists?

Randy V

Success - knock on wood.

We had both the LH and EZK computers resoldered as there were many aging suspect joints in each.

Ran fine all the way home.

Randy V

After performing well for a month the condition has returned. Engine cuts out intermittently and will restart immediately.

Looks like I need a rebuilt EZK ECU rather than an LH ECU based on previous troubleshooting?

James Bailey

very unusual for the EZK to be having problems...

the flyin' scotsman

I wonder if theres a component that was heat affected by the fire and subsequently has intermittent connection?

Randy V

All signs point to one or both of the ECUs.

James Bailey

You still have the ignition monitoring relay ?? it has the power to cut off injection to 4 cylinders can malfunction and take out all 8 ....

Randy V

Installed a new CPS today - no improvement, dang it.

We're looking at next replacing the Hall sensor on bank 1-4 as it looks very crusty.

Could that be the culprit?

James Bailey

I recall reading that it simply retards the timing if not working....but that was a long time ago

the flyin' scotsman

doubt it unless the wiring/connector are somehow shorting. My GTS had the Hall Sensor 'disconnected' when I first bought it and understand the system defaults to ignition protection retard position IIRC

Did u get the new/rebuilt EZK installed?

SeanR

Hall sensor won't be causing this. Swap out the computers one by one to test, I'd not buy them just yet.

Randy V

Thanks for the info on the Hall sensor.

John Speake indicates these symptoms do not seem to point to either the EZK or the LH as they either work or they fail completely. He hasn't seen either fail intermittently as is the case here.

I don't have a local source for good loaner ECUs unless someone may want to help me out.

The condition seems to be heat related. Cut out does not occur until after 10-15 minutes of driving in typical current daytime temps of 65* plus. This morning it was in the high 40s and it did not cut out once during the 40 minute drive to work.

AO

Hard to believe there isn't anyone near you to loan you a set of known good ECU's. If you need, I can send you my tuning/spare set. They have PEMs installed currently, and I'm not sure which map is on them, but you could put your current chips in them if you wanted. I won't be needing them for a couple months. Just say the word and I'll get them wrapped up and shipped out to you.

FLYVMO

Randy,

Computers do fail intermittently during overheat conditions, specially when a marginal IC, solder or trace connection expands/contracts due to temperature variations. While I can't speak specifically about the LH/EZK, I had a very similar situation with an aftermarket ECU. It would run great until summer time when cabin temperatures in the footwell increased. Turns out the internal components would "flip out" once the temperature got too high (verified by the manufacturer during warranty claim). It happened during a long cross country drive for me, and the temporary solution to get me home was to remove the carpet cover in the footwell to allow enough air circulation around the computers. One suggestion is to try driving with the carpet cover off to allow more air in that area. See if it still happens after 10-15 minutes during temperatures where it "normally" cuts out? From reading your entire post it sure sounds like a computer heat issue to me.

Good luck,
Carl