10-11-2013, 12:15 PM
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#1
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Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,152
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quick search indicates maf as the general culprit. unplug it and see what happens.
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10-11-2013, 12:27 PM
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#2
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Registered User
Join Date: Feb 2013
Location: Land of naught
Posts: 1,302
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Quote:
Originally Posted by The Radium King
quick search indicates maf as the general culprit. unplug it and see what happens.
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What's your source for the de-coding? I've found 3 different charts! It's a little confusing!
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Death is certain, life is not.
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10-11-2013, 12:53 PM
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#3
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,619
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Quote:
Originally Posted by woodsman
What's your source for the de-coding? I've found 3 different charts! It's a little confusing!
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The MAF has little impact below 3,500 - 4,000 RPM, it should not impact starting....
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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10-11-2013, 02:10 PM
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#4
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Registered User
Join Date: May 2011
Location: weehawken nj
Posts: 240
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Quote:
Originally Posted by JFP in PA
The MAF has little impact below 3,500 - 4,000 RPM, it should not impact starting....
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It can impact starting if its shorted out. Although it is unusual.
Id recommend unplugging the sensor and seeing if it fires up.
If that doesnt do it, check for spark, fuel pressure, and injector pulse. If you cant check for injector pulse, a lack of both spark and fuel delivery will be enough to condemn the main relay or the crank position sensor.
The reason you wont see spark of fuel with a bad crank sensor is because the ECU needs to see 150-200 rpm ( cranking ) before closing the relay and sending spark and injector pulse signals....
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10-11-2013, 03:21 PM
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#5
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Registered User
Join Date: Feb 2013
Location: Land of naught
Posts: 1,302
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I'm going to try locating a fuel press. tester today and then I'll also try unplugging the MAF' tonight. I would think that the crank sen. would cost the least.... Thanks for the help folks. It's soon time to put baby away for winter so I'm anxious to get this solved!
__________________
Death is certain, life is not.
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10-12-2013, 03:30 PM
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#6
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Registered User
Join Date: Feb 2013
Location: Land of naught
Posts: 1,302
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l located and bought a generic fuel pressure tester with a Schrader valve fitting on it for $50 and it fits the car. I made a jumper wire to power the fuel pump specifically ( Bentley manual). Gauge indicated no pressure at all but there was battery voltage at the plug for the pump. The pump remained silent. I've pulled it out of the tank and will order a new one when the dealer opens next. Hopefully a new one solves all. Is there anything else I should replace, 'while I'm in there'?
__________________
Death is certain, life is not.
Last edited by woodsman; 10-12-2013 at 05:27 PM.
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10-12-2013, 10:12 PM
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#7
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Registered User
Join Date: Sep 2013
Location: Montreal, QC. (currently expat to Shanghai)
Posts: 3,249
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Quote:
Originally Posted by woodsman
Is there anything else I should replace, 'while I'm in there'?
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Every time I have to fix either fuel delivery, intake issue, replacing MAFs, before tuning, or when the tailpipe blacken, etc etc... I also change my six little sparkplugs as well. Cheap cheap!
Sorry to hear about your FP mate. Hopefully she will take your back on the roads on time before storage
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'97 Boxster base model 2.5L, Guards Red/Tan leather, with a new but old Alpine am/fm radio.
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10-12-2013, 05:03 PM
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#8
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Registered User
Join Date: Nov 2012
Location: Southern, CA
Posts: 460
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Quote:
Originally Posted by JFP in PA
The MAF has little impact below 3,500 - 4,000 RPM, it should not impact starting....
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Jeff, I wish that were true, but go check my MAF threads. What I had was no problem on an intial cold start and drive. On a hot restart - after letting the car sit for a while - I would get a no start condition. Engine would crank, start, stumble, stop. All in about 1-3 seconds. Pulling the MAF would allow the car to start and drive off without any noticble perormance issue. Replacing the MAF resolved the problem.
I originally though the issue was a crank position sensor, so I have one in the bag now. JD suggested I pull the MAF as a trial test. Good thing to or I'd still be stumbling aroung repalcing parts looking for a solution. As an FYI this was with a P0102 error though.
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1999 Boxster Zenith Blue Metallic/Savanna Beige
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