JAKE_MORSE Posted February 25, 2009 Share Posted February 25, 2009 help guys. got a good one here. o4 f250 putting out 3-5lbs of boost. smoke tested air system and exhust with 20 psi of shop air and found nothing. dropped exhust and drove unit with no change. fuel press. at 55psi all time.hotline said to hange out turbo and MAF and MAP from good truck, no better. Then thy advised me to swap out the PCM. no better. While monitoring PIDs VGTLRN is no. Turbo will not learn. swapped out air filter and fuel filters. total dog of the line. can rev. unit without problems but under load it's horrible. Any ideas? Quote Link to comment Share on other sites More sharing options...
kridd12 Posted February 25, 2009 Share Posted February 25, 2009 is the abs light on. we had one do the same thing exactly. ended up all three abs sensors were bad causing it to default basing load of oss in tranny. replaced rear abs sensor to try now worked fine. Quote Link to comment Share on other sites More sharing options...
mchan68 Posted February 26, 2009 Share Posted February 26, 2009 You are obviously working on an early 2004 truck (with a 2003 engine). With the information you've provided so far, I can only suggest you look at ICP readings. Another stupid question, but the engine oil level isn't overfilled is it? How about oil viscosity? Quote Link to comment Share on other sites More sharing options...
Brad Clayton Posted February 26, 2009 Share Posted February 26, 2009 I wouldn't go any further with anything until I got the VGT learn to say yes. Use tsb 06-24-06. It's worked for me every time. Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted February 26, 2009 Share Posted February 26, 2009 Jake, is the base engine for sure good? What is your IPR% duty cycle at idle? And what is the Load pid at idle? How does this thing start cold? I seem to remember another topic that Keith had about lack of power with load pid over 45% at idle that indicated injector failure. Quote Link to comment Share on other sites More sharing options...
JAKE_MORSE Posted March 2, 2009 Author Share Posted March 2, 2009 Guys, thanks for all the suggestions and tips. Found out it was the ICP sensor plug was screwed up. replaced sensor connector and retested ok. why did hotline not point me in this direction? I get better results when I contact technicians!! Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted March 2, 2009 Share Posted March 2, 2009 Glad you got it fixed! Were you watching ICPV and not ICP? It's REALLY important to look at ICPV as one of the first PIDS you monitor in Datalogger for any driveability problem you encounter. ICPV must be between .17 and .24VDC KOEO and is usually about .8-.9vdc idling. The reason you need to focus on ICPV and not ICP is that ICPV is a factual voltage taken from the ICP sensor, but ICP pressure is CALCULATED by the PCM and will be substituted in the event of an high pressure problem. For example, if there is an active HP oil DTC, the scan tool can report ICP pressure rising normally during a cranking, no start cycle to about 1200psi, but the ICPV stays fixed at .20vdc. This really fools the tech who's watching ICP and not ICPV into thinking the HP oil system is fine. That's why the IDS pulls up both ICP and ICPV automatically when you select ICP in Datalogger. Rule of thumb: Get used to watching ICPV more than ICP. It'll save your ass bigtime. I've seen more guys burned by this...... Good Luck! Quote Link to comment Share on other sites More sharing options...
JAKE_MORSE Posted March 3, 2009 Author Share Posted March 3, 2009 Bruce,got cought watching ICP press. one of the other tech.s here caught the voltage signal and thats what lead to the repair. Thanks for the info.(which I have printed off and stuck in my tool box.)Hope you don't mind. Quote Link to comment Share on other sites More sharing options...
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