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Strange Electrical Issue?

R

Redlineracer12

Addicted CEG'er
Joined
Apr 26, 2004
Messages
5,538
Location
Twin Cities, MN
Here's the story, was driving down the highway around 65mph when the car stalled. Pulled over and the car wouldn't start (cranked but no start). I crawled under the car while my gf was cranking it and couldn't hear the fuel pump running. So I decided I'd check all the fuses under the hood, they all looked good. After doing that I tried again and it started right up. Drove the car home with no problems and no check engine lights. I decided I'd check for pending trouble codes when I got home with my XCal 2. I had the car off, plugged in the XCal, turned the key on and strangely the fuel pump kept pumping the entire time the key was on (engine off). I tried to read for codes and it came back with "Error reading codes". I tried cranking it with the XCal plugged in and it wouldn't even turn over. I thought that's strange so I unplugged it, the fuel pump cycled normally when I turned the key to the run position and the car started right up. Tried plugging in the XCal again and the car died immediately :confused:

Here's some history, car is a 99 Cougar V6 MTX with all original return style fuel system (PCM SSD3 I think). Now it has roughly 90% of an SVT engine (block, heads, cams) and I run an SCT 4 position chip with switch. Over the last few months I've been suspecting the fuel pressure regulator of going bad (not that it's necessarily related). Car will stumble a little bit when I start it after it's only sat for about an hour, much more or less time and it starts fine.

I'm going to start by making sure my chip isn't loose or getting a bad connection but I thought it was very strange that the OBD2 port is causing the car to stall :help:

Thanks for any advice :)
 
Something else I forgot, apparently the check engine light might have come on a few seconds before it stalled. But after I got it started (I pulled the fuses and probably lost the code) it was off all the way home.
 
This happened to me once - my car has a new FSVT fuel pump. Same symptoms as you - I passed a truck and while I was slowing down the car stalled out. I tried starting it while I was slowing down - I only was able to get it to start after I waiting a few min on the side of the road..
 
I had a problem with the 95 Fuel presure regulator. When the engine was cold it would stumble if you gave it gas. Once it warmed up it was fine. So, I would think that might be the issue you have there.
 
Chip is clean and secure :( If I switch it to position four (stock tune) it will let me scan for codes and the obd2 port doesn't cause the car to stall.

Now I'm sorta stumped, maybe a problem with the chip?
 
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