mod harness ecu trouble 4.8
Thread Starter
Staging Lane
Joined: Aug 2011
Posts: 93
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mod harness ecu trouble 4.8 I have a 2008 4.8 , the harness has been changed to the basic hookup, no vats no smog,no rear 02 sensors.
It starts and runs but ,
Here is a list of the codes,
P0030 bank1 sen 1
P0053 bank 1 sen 1
P0054 (rear sens should not have this,right?)
p0135 bank 1 sen1 heat
po134 bank 1 sen 1 no action
p0174 lean bank 2 (no other codes on bank 2, maybe the other stuff affecting it)
p0300 ( i have the freeze frame data on this if needed)
I tried swapping the front sensors and clearing codes and the same codes come back. So that eliminates bad o2 sensor right or code would change to bank 2?
Does anyone know of a person i could send harness and ecu to get this fixed? Maybe someone that has a test engine to run it on something?
thanks
Lowell
It starts and runs but ,
Here is a list of the codes,
P0030 bank1 sen 1
P0053 bank 1 sen 1
P0054 (rear sens should not have this,right?)
p0135 bank 1 sen1 heat
po134 bank 1 sen 1 no action
p0174 lean bank 2 (no other codes on bank 2, maybe the other stuff affecting it)
p0300 ( i have the freeze frame data on this if needed)
I tried swapping the front sensors and clearing codes and the same codes come back. So that eliminates bad o2 sensor right or code would change to bank 2?
Does anyone know of a person i could send harness and ecu to get this fixed? Maybe someone that has a test engine to run it on something?
thanks
Lowell
Thread Starter
Staging Lane
Joined: Aug 2011
Posts: 93
Likes: 0
Well it died today.
It started smelling funny and power dropped to near nothing. Now no start.
Fuel is at rail IDK press got to rent a tool
I shot a small amount of carb cleaner in intake and it fired somewhat.
The battery was removed before I could scan it to see what codes were from failure.
Could the O2 trouble cause no start?
It started smelling funny and power dropped to near nothing. Now no start.
Fuel is at rail IDK press got to rent a tool
I shot a small amount of carb cleaner in intake and it fired somewhat.
The battery was removed before I could scan it to see what codes were from failure.
Could the O2 trouble cause no start?
Could the O2 trouble cause no start?
O2 are ignored at startup. The PCM works in openloop at cranking and startup, until engine and O2's are warm enough to enter closed loop. Until then any signal from O2's is irrelevant to PCM.
I think you have an electrical problem, like a missing ground or a blown fuse. One or more circuits aren't being supplied.
Thread Starter
Staging Lane
Joined: Aug 2011
Posts: 93
Likes: 0
No, not directly.
O2 are ignored at startup. The PCM works in openloop at cranking and startup, until engine and O2's are warm enough to enter closed loop. Until then any signal from O2's is irrelevant to PCM.
I think you have an electrical problem, like a missing ground or a blown fuse. One or more circuits aren't being supplied.
O2 are ignored at startup. The PCM works in openloop at cranking and startup, until engine and O2's are warm enough to enter closed loop. Until then any signal from O2's is irrelevant to PCM.
I think you have an electrical problem, like a missing ground or a blown fuse. One or more circuits aren't being supplied.
I will chk today going back to the scene of the crime today to see if I can limp it home. Taking trailer just in case.
Its bound to be firing ok as the carb cleaner made diff right?
Other than fuel pump itself (gona do a press test to ck it) what else should I ck if its no fuel getting from rail to engine?
Thread Starter
Staging Lane
Joined: Aug 2011
Posts: 93
Likes: 0
Power going to pump but no fuel at rail. and pump not making a sound.
So Im wondering if I used the correct pump as it was new and appears to have failed very soon. (1,500 miles)I used a oem pump or a 97 tj with the corvette filter regulator. Im thinking I should have used the walbro or the 05 wrangler pump.
So Im wondering if I used the correct pump as it was new and appears to have failed very soon. (1,500 miles)I used a oem pump or a 97 tj with the corvette filter regulator. Im thinking I should have used the walbro or the 05 wrangler pump.
