ichpen

Hey all,

Got a bit of an electrical gremlin since last weekend. Basically car will start then about 5 seconds later will shudder and stall. Motor sound healthy so I'm looking for electrical gremlins here and some wacky suggestions.

This all happened after some very heavy rainfall.

Things I've checked:
MAF - had a bad/rusty connector swapped out. Found fuse was blown. Replaced. No go.
Tried a maf from a z06 - runs a bit longer but same issue
Checked voltages to fuel pump, replace fuel filter - same issue
Fuel rails prime ok so I'm not ruling out a fuel pump issue yet

Going through all the other sensors now.

Can't for the life of me think it's maf as I'm running an SD tune and maf is essentially off. Sooo, maybe something else got fried in the watery heaven that was last weekend.

Anyone had similar issues ever?

Cheers.

RADEoN

iTrader: (12)

do you have a code scanner?

DMM

Did this happen immediately after driving through water (stalled)? Or, after you shut it off and tried to restart? Do you have any DTC's stored? This sounds as if it could be a crank sensor also, don't know if you can scan crank ckt rpm, I have seen them read 0 above a certain RPM...after the engine initially starts, the RPM flare-up exceeds what it can read and it sends a "0" signal (if that makes sense).

MAF should have no effect on anything if you're SD, unless its shorted and drawing down the 5v buss. I'd leave it unplugged.

Also, if you have a spark tester, throw it on there also.

ichpen

Thanks. Good suggestions.

No, didn't happen immediately. I drove it quite a bit after the rain storm. Left it alone (no rain) then it ran for a few mins, started stumbling and cutting out and that was that.

Crank sensor might be a good place to check also. And yes, maf shorted I think, blew a fuse.

Not sure what a spark tester is.

Only other thing I can think of is it fried the PCM somehow but haven't got to that stage yet.

ichpen

I have many. No codes sadly.

ichpen

crank sensor reads perfectly.

vmapper

iTrader: (8)

Im guessing you have the MAF still plugged in, you need to utilize IAT in SD?
In a situation like this... scanning is important...
set up some histograms for LTITS and STITs along with fueling... throttle position / airflow...and look at the RAF closely...see if its a fuel or air issue...

ichpen

Yes. My next step. I only get 5 seconds of run time so it will be tiny logs. MAF is plugged in yes.

Also thinking maybe alternator killing fuel pump (not enough volts) but interior lights seem solid until the engine dies.