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Ramp's Avatar
 
Join Date: Jul 2012
Location: Long Island
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Stalling '86.5 - Quick help

Just bought first 86.5 928S, one owner, 41k. Just delivered yesterday. Ran fine, took it this morning to get gas (on reserve) before I started to start the sorting process. Ran fine until after I filled her up. She starts fine, idles smooth but when you give it gas she stalls.

I had hoped to keep her running while I started to sort out the electrical gremlins but oh well.

What should I be checking first ?

Thanks and here we go.
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Old 12-02-2017, 07:43 AM
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I wonder how long this car has sat? Any maintenance history? Have all the filters been changed? Sounds like it is starving for air or gas or both.
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 12-02-2017, 08:48 AM
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^^^^+1 - could be gas in tank has been in there a while - some sediment in bottom of tank - you stirred it all up when you added gas and now it's clogging something - screen, filter, pump, injectors? - might pull end cap off fuel rail and check flow and pressure - carefully
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Old 12-02-2017, 08:54 AM
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The car has been driven but not driven much in the last 6 months or so. It needs to be fully sorted which I planned on but mechanically the car seemed like a DD.

I'm inclined to think it's stirred up crap from the tank - eve n the way home from the station she ran fine. Onl started when I went to take her out again.

Before I check fuel rail should I replace filter ?
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'86.5 Porsche 928S
'87 Porsche 3.2 Cab
'12 Jaguar XJ
'14 Mercedes GL550
'16 Mercedes C300
Old 12-02-2017, 10:24 AM
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Check Temp II and MAF
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Old 12-02-2017, 12:30 PM
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after sitting, she started right up and drove fine again.

Should I be thinking tank cleaning or just change the filter ?
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'86.5 Porsche 928S
'87 Porsche 3.2 Cab
'12 Jaguar XJ
'14 Mercedes GL550
'16 Mercedes C300
Old 12-02-2017, 02:06 PM
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Quote:
Originally Posted by Ramp View Post
after sitting, she started right up and drove fine again.

Should I be thinking tank cleaning or just change the filter ?
If it is now running OK, I would drive it and run some gas through for some miles. Then put some Techron in the tank and drive again. You may want to put a new gas filter on. There is also a check valve on it that might need to be cleaned. Do the simple things first!
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1986 928S
32 valve engine
All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires.
Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L
Old 12-03-2017, 04:32 AM
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