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Heavy Metal Relocator
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cold start rpm adjustment
I am talking about a 4.5L Euro K-JET motor here.
OK folks, how do you turn down the rpms on cold start. (I'm hesitant about just disconnecting the cold start injector, even though it doesn't get very cold here in south Texas) on cold start, the rpms go straight to near 2000 before the engine warms up. after warm up, the rpms are about 800. warm up usually takes about three blocks of driving. everythings fine after that.  all vacuum hoses have been replaced, new injector seals, new intake boots, new intake gaskets, etc.... Vacuum limiter has not been removed. (but might be soon!) it's driving my wife nuts, considering the exhaust note isn't what you'd call 'quite'.  not what you'd call neighborhood friendly at 5:30AM... and yes, I have the fwm's on CD, just haven't got that far. your turn----- regards---rhjames 
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Absence of Evidence, is not Evidence of Absence. Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma." |
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04-10-2007, 06:54 PM
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Registered
Join Date: Nov 2006
Location: philly, pa
Posts: 21
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i don't if you can turn it down but i would check your auxiliary air regulator and cold start valve a defective unit causes hard idle when engine is cold.
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04-10-2007, 07:38 PM
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Registered
Join Date: Feb 2007
Location: Cybertown, Texas
Posts: 108
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On CIS, the cold start injector is not the item you need to look at.
MB calls theirs a Warm-Up Regulator (WUR); I'll have to look at the Porsche docs to see what they call it, I’m sure it’s the same. The WUR acts as both a Fuel Regulator (used during idle), and as a Warm-Up Regulator. The point is, during warm-up, the WUR bumps up the fuel pressure just little more than normal. When it goes out of spec, it bumps the fuel pressure up either too much or for too long, as it is always better to run rich, than lean. The WUR is controlled by vacuum and a heated bi-metal strip inside the WUR. So you would need to check too make sure you’re getting the correct voltage and vacuum to the WUR. In order to check the WUR itself, you will need a fuel pressure gauge and fittings to tap into the fuel line that runs to the fuel distributor. P.S. These are just a few things I can remember off the top of my head, I suggest looking at the FWSM for specs and procedures.
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Cheers, T_MaX 89 S4, Auto-box, Silber/Blue, 320ish RW HP/TQ Last edited by T_MaX; 04-10-2007 at 10:15 PM.. |
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04-10-2007, 10:04 PM
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