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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| 1995 Gas - Starting Issues
I measured the voltage from the battery and the voltage after the engine is switched on. 12.xx without the engine and 14.3x after the engine comes on. I thought the alternator wasn't charging the battery but apparently that's well within voltage range. I am having issues with cold starts and it can be painful and long drawn out. Also the ABS light won't switch off sometimes. After a while the car starts but with at a very low RPM. Whatever mechanism or device that normally boosts the RPM when it starts is definitely not working. Normally after starting you hear a sustained rev that lowers after a few seconds. That's not happening. I got the throttle body cleaned -but that was a wrong diagnosis. Any ideas welcome. Thanks
Edited by King_GH 5/22/2016 1:17 PM
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| RE: 1995 Gas - Starting Issues
Take a view of this video. https://www.youtube.com/watch?v=4sLoOpBaySU
I've had this happen to me twice on the same car due to one of the commutators grinding down the carbon brushes very quickly. With the engine running. sometimes it would read 14V and then just 12v battery voltage and going south quickly. He even mentions intermittent ABS light associated with the voltage issue.
Engine temp sensor that feeds info to the ECU is a possible suspect, then vacuum leak.
Edited by J.R. 5/22/2016 2:00 PM
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Fernando BR
Date registered: Jan 2007
Location: Brasil
Vehicle(s): G500/05 300GE/91 300GD/80
| RE: 1995 Gas - Starting Issues
So you do have KE jethronic , there is a cold start injector and an electric temp sender to it ( truck has 3 temp senders , dash , electrical vent , KE ). there is a diaphragma pressure regulator , its connected to distributor , atmosphere and tank return.A leak on it or tank return line its a possibility. Attatched G KE WIS PDF. Its all very simple and parts are 95% the same of 300E.
Hope helps
Attachments
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 0030 - Function description_ Design and operation A.pdf (43KB - 7 downloads)
0030 - Function description_ Design and operation B.pdf (341KB - 7 downloads)
0030 - Function description_ Design and operation C.pdf (382KB - 7 downloads)
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| RE: 1995 Gas - Starting Issues
Thanks J.K, I've seen this video and in fact I thought that the alternator was the issue initially until I did the load tests for the voltage and it really held it's ground. After turning on the A/C, high beams radio etc then revving the engine for a while, the voltage never dropped or go beyond 14.34. I'm beginning to suspect the idle control valve as it may be quite dirty around 118000km.
Edited by King_GH 5/22/2016 2:03 PM
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King_GH
Extreme Veteran
Date registered: Oct 2011
Location: London
Vehicle(s): 95 G300 RHD
Posts: 324
| RE: 1995 Gas - Starting Issues
Thanks. I think I'll start with cleaning the Idle speed adjuster. What is the best non-intrusive cleaner for these parts?
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J.R.
Elite Veteran
Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
| RE: 1995 Gas - Starting Issues
I am not familiar with the engine, but here are some ideas.
Are there some electrical checks you can do on the idle air control valve? Is there a fuse that protects that circuit that may or may not be connected to the ABS light?
If all checks out electrically for the IACV, I would remove the IACV for an off engine cleaning. Carb Cleaner has always done well for me in other cars IACV. I am careful to not let the electric motor/servo get exposed to the carb cleaner.
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