BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 Electrical type stall

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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Electrical type stall   Thu May 16, 2013 2:42 pm

Matts car...95 Imp
Running fine for 6+ months after full tuneup
Lately....out of nowhere (but only when its hot) comes a random stall
One day, he'll make 2 or 3 trips then, on the 4th....it'll shut down
Happens even when he's moving (but at 10-15mph not 50)
Re-starts no problem. One time he had to do this 3 times.
Whatcha think?
If you have time here's more info?
1st time I found no fuel pressure
Measured 8.5V at the feed side of the harness ..wtf?. Jumped the 12v red wire & had 12 @ the connector.
The gray power wire of the connector was not pinned tight in its housing, so I fixed that , connected, primed with the 12V red wire & heard the fuel come into the rails.
Disconnected 12V prime wire & all was fine. Hoped it was the connection.
I took it out & ran it last night after checking everything parts, harnesses, fuses...ran fine, for what it is.
I tried to make die & it wouldnt.
I have him take me around later & 2 stops out, it dies at a light, restarts no problem & didnt do it again.
He seems to think its like an electrical cutout but I think he may just see the dash drop out when it stalls.

Some extra info
Changed out the coil & ICM with known good....same (yes...heat sink compound applied)
swapped out the FP relay with known good..same
Fuses good, all fuse box connections (pwr stud & bus=good
I had rebuilt the opti with original sensor & housing, new rotor & cap but a no name source (brass contacts)
Opti harness & vent/vacuum good
RMS ES381 pump w/ new sock, FLS1072 sender installed 8/09 with 2 years of being parked many miles after that
There's more but this is WAY to long

Looking for someone to say....mine did the same thing & I found "xxx"
I'm thinking either go back in after the fuel pump(but not until I see a no prime or low pressure happen)
Or put a cap & rotor on the opti but damn....only time I had a failure was a long crank in the wet = opti


_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: Electrical type stall   Thu May 16, 2013 2:57 pm

That's a very interesting situation. Only when it warms up? Usually cold/wet, like you said = opti.

I would have said coil/ICM but you said you tackled that.

I'd say, and I know it's a job and a half, swap out the fuel pump with a kown good one and go from there.

Sorry, I have not (yet) had this problem.

I know it sounds dumb and repetitive, but absolutely double and triple check those damn grounds on the drivers side head. It took me an (inexperienced) year to find that problem on the '95 I had.

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95brmw



Posts : 1431
Join date : 2009-11-10
Age : 32
Location : Connecticut

PostSubject: Re: Electrical type stall   Thu May 16, 2013 5:09 pm

2 things come to mind, could be a weak connection at the coolant temp sensor or the harness inside the tank burning up. My 9C1 would almost die on me when I had a weak connection at the CTS, but I don't think it actually stalled. The tank wiring is known to melt at the bulkhead, just throwing that out there.
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GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Electrical type stall   Thu May 16, 2013 5:27 pm

Check connections at the MAF. Swap with a known good one if connections are good. My caprice did that after the motor swap and it was because one of the MAF wires was broken and sometimes looking contact. Would die at low speed sometimes.
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Pooge



Posts : 1698
Join date : 2009-03-24

PostSubject: Re: Electrical type stall   Thu May 16, 2013 7:59 pm

I think I have seen you give this as advice before, but I didn't see it listed...

I had a similar issue and it ended up being one of the coil/ICM wires slightly broken inside the jacket, the back of that connector is a weak point for the wires, mine damn near fell apart in my hand when I disconnected it.

Doug

_________________
1996 Impala SS - 45K original miles - 5.3 LS swap - Brand new Bilsteins...WHAT A DIFFERENCE!
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IMPALADAKID
Admin


Posts : 1512
Join date : 2009-01-17
Age : 48

PostSubject: Re: Electrical type stall   Thu May 16, 2013 8:25 pm

Pooge wrote:
I think I have seen you give this as advice before, but I didn't see it listed...

I had a similar issue and it ended up being one of the coil/ICM wires slightly broken inside the jacket, the back of that connector is a weak point for the wires, mine damn near fell apart in my hand when I disconnected it.

Doug
I have seen this many times. I would look at those wires. With the car running in park, try wiggling those three wires to the coil harness. If it does no0t do it, it can still be bad, but chances are very good that it will cut out or stall all together from wiggling it.
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MASShole9C1



Posts : 4211
Join date : 2009-12-16

PostSubject: Re: Electrical type stall   Thu May 16, 2013 8:55 pm

I found my problem by pouring water on the area. The engine stopped dead in its tracks. Problem found. Broken and corroded wires.
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Electrical type stall   Thu May 16, 2013 9:57 pm

I looked very closely at those wires
Does seem like a stress point,,,wiggled & pulled....no change

Before we left the show tonight I threw the gauge on & FP primed right to 42......THEN dropped right to nothing
Funny thing was, thats NOT what it did the other night
I did dump some Seafoam in the tank last night
Going to the garage to see how the return works to figure out how the rail holds pressure

Its either something in the return or an open injector as far as I know

Will check MAF wiring again & ICM wiring again
Thanks

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Electrical type stall   Thu May 16, 2013 10:09 pm

OK....I need help
The pump brings pressure to the line thru the regulator
The return line goes back to the sender & into the bottom of the tank.
How does the rail maintain pressure?
The return line has nothing to do with the regulator right?
(cant go look at the car now....its sudden death for the Bruins Rangers...go Bruins)

_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Electrical type stall   Fri May 17, 2013 8:39 am

OK, I didnt see it correctly last night
The pump brings pressure directly to the rail
RETURN has the regulator inline (think thats what Crovo tried to tell me last night)
Pump feed is a 1 way (unless the flex hose is compromised), return is held at pressure via the regulator
I KNEW it wasnt rocket science....just couldnt wrap my head around it last night

So....if the regulator works properly when running...does that mean its good?
(Also without vacuum it jumps to like 42-44 & stays there....no fuel smell or leakage)

If the regulator is good, I'll be looking for an injector or pump supply line fail
He DID notice his mileage has dropped off recently (presumably since this problem started)
THAT makes me think stuck injector....I'd rather R&R the rail then look for wet plugs...
Afterburners are easier to work with but STILL a PIA for some plugs


_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Electrical type stall   Fri May 17, 2013 8:53 am

I think it's a valve spring. Razz

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
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http://impalass.uniquekind.net/
GasTT



Posts : 2675
Join date : 2009-01-19
Age : 28
Location : Treasure Coast, FL

PostSubject: Re: Electrical type stall   Fri May 17, 2013 9:00 am

please, it's the fuel pump grounds
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sdstick



Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: Electrical type stall   Fri May 17, 2013 9:08 am

toomanytoyz wrote:
I think it's a valve spring. Razz

Should I wait until the sun hits it before I work on it?

GasTT wrote:
please, it's the fuel pump grounds

OK you 2.....glad you could start your AM off with a giggle.... Arrow .. Razz




_________________
Steve


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4 Hole...ee...grail
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Stolen...by Matt. Cool
Whine..eee...Silver LS6
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toomanytoyz
Club President


Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: Electrical type stall   Fri May 17, 2013 9:45 am

OMG! I lol'd! Very Happy

Yes, must wait for sunset. Lol

_________________
Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
www.badassofne.net
"Ooooh! Look! Something shiny!"
NO MORE UNICORNS!!!!!

LOWER IT!!! Wink
Back to top Go down
http://impalass.uniquekind.net/
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PostSubject: Re: Electrical type stall   Today at 3:28 pm

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