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Old 08-14-2012, 01:35 PM
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bad IDM?

HELP PLEASE!!!
so my truck randomly wont start i cant figure out why. it seema to mostly happen when te truck heats up to normal temp and i shut it off and let it sit for a while. ramdomly it will just keep cranking and it dies not get fuel, (no vapor from tail pipe.) when the truck doesnt start i usually use most of the battery cranking it then it fires up normal after i hook up jumper cables. most of the time the truck fires up normal. every time i get the truck started it runs like a gem. when i open the fuel bowl there theres fuel. i already put 2 new pumps in and and a set of injectors. i unplug my chip to see it it helps but does nothing. i have a ts 6pos chip and occasionally it suges on the 140 setting when i let off the gas it feels like i just tapped it again. from what i read i think the idm is the net step any help would be great! thanks
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Old 08-14-2012, 03:35 PM
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When it happens, does the tach move?
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Old 08-14-2012, 04:17 PM
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tach moves and WTS light comes on like its supposed to, no CEL could this have anything to do with the IPR?
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Old 08-15-2012, 11:32 AM
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Remove (do not just set it to stock) the chip and see if it does the same thing. Cheers!
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Old 08-15-2012, 02:40 PM
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already tried it, no luck
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Old 08-15-2012, 03:45 PM
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Indeed, if you're getting WTS and tach, but no vapor, that's sounding more like fuel, or possibly an IDM issue. Any chance you can get your mittens on an Aeroforce ScanGauge, or a beater laptop with AutoEnginuity, to lug around as you drive? Then, when it happens, you can hook it up and check injection pressure while cranking, for example, or do a buzz test.

Hmm, has anyone ever heard of a mechanical fuel pump failing based on temperature? For that, you'd have to check it with a stick tire gauge, right when it's happening.
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Old 08-15-2012, 08:54 PM
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im gonna try it with a big fancy sanapon scanner the only problem could just be having the scanner and the problem at the same time. but i have tried it with a stick gauge and the pump is working, im getting about 40 psi.
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Old 12-10-2012, 01:13 PM
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im still having the problem. it only happens when the engine is a certian temperature. (after it comes up to operating temp and cools for like 45 minutes or so, its differnt depending on the outside temperature.)i have had a snapon scanner on it and all the values are fine. (IPR and ICP) i put in a new ICP anyway im really stumped and i need to figure out what it is this is my only daily driver PLEASE HELP!!!
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Old 12-10-2012, 01:50 PM
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Set up the scanner to display engine oil temp (EOT) and intake air temp (IAT?) under those specific conditions (warmed up, then wait 45 min). Is there an aftermarket intake in the truck? If so, where is the IAT sensor located?
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Old 12-10-2012, 04:06 PM
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yes i have an AFE intake. i just left the IAT just hanging in the open by the air cleaner
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