Idels fine, no cel on, wont excelerate or bogs, no power 6 DTC codes stored

Tiny
ZX4U2NV
  • MEMBER
  • 1998 DODGE RAM
  • 170,000 MILES
1998 dodge ram 1500 5.2 4x4 truck was running fine, stopped for gas, after filling started losing power and didn't want to accelerate, continued to get worse there. CEL never came on, it does work when you turn on key. Pulled codes p1388 p0138 p1492 p0300 p0301 p0303 fuel pump is working while running. I am also missing my cover for fuse/relay box under hood, so I have no clue which relay is for ASD. My owner's manual shows a different layout then mine.
Monday, September 16th, 2013 AT 8:26 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Here is pic for asd also check battery for condition including load test an dclean battery terminals. Also switch asd relay with a like relay and see if it doesn the same this can be several things. Including a bad pcm or wiring. The o300 series codes are misfires an ddue to being very hard to diagnose then a pro should really look at this.
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Tuesday, September 17th, 2013 AT 6:13 AM
Tiny
ZX4U2NV
  • MEMBER
  • 4 POSTS
Battery tested good, I measured resistance on battery temp sensor 13 ohms, not sure what it should being it measures temp, I woud think it would change with temp. This truck also has overhead outside temp LED, someone mentioned that these will also be tied in with pcm? Could this be a possible fuel pressure regulator issue? Where should I start? Can't afford the dealer with seven kids and a wife.
Thanks
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Tuesday, September 17th, 2013 AT 12:42 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check your fuel pressure at rail auto parts rent the gauges. Should be 44-54psi with engine idling if you don't get minimum your pump is probably bad. Also check for wiring touching the frame/body something like that because it says the asd circuit is bad. Which goes to fuel pump. Check your O2 sensor wires for damage like burnt through exhaust if you rbat temp sensor is higher than 5ohms your pcm may be bad causing the mulitiple codes.
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Tuesday, September 17th, 2013 AT 1:22 PM
Tiny
ZX4U2NV
  • MEMBER
  • 4 POSTS
I have gauge, will check tomorrow and report back.
I switched relay with 2 others and no change.
If asd was activated, there would be no fuel or spark correct?
Also when I tested bat sensor it was unplugged. Is there a proper proceeger for testing plugged in? Also sometimes my overhead will desplay the wrong outside temp.
Am I correct when thinking O2 sensor is seeing a rich condition?
I'm thinking maybe too much fuel pressure, thinking possibly bad regulator? Trying to think outside the box.
Thanks again
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Tuesday, September 17th, 2013 AT 6:30 PM
Tiny
ZX4U2NV
  • MEMBER
  • 4 POSTS
Also, I cleared codes, and still no CEL and has not stored any codes yet? I believe regulator is not computer controlled but preset.
Crossing fingers till tomorrow
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Tuesday, September 17th, 2013 AT 6:34 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I really think this is leading to a pcm problem but it shodl be checked by a pro before replacing it. Or connections, wireing issues.I have no further suggestions.
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Wednesday, September 18th, 2013 AT 6:07 AM

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