HI!... Any of you electrical guru's out there, can you please chime in. I'm stumped.

O.k on THURSDAY while driving home from work I started to smell oil burning and a few minutes later tons of blue smoke was poring out the back of my truck. Thank god my race pan holds extra engine oil (11 liters total in system) because I lost 5 liters of oil on the way home, about 2kms. Got home and realized that the oil pressure sending unit blew. I've never seen this before but the oil was going straigh through the oil sender enough to pop the harness plug for it right off! Well at 80PSI oil presure the oil was shooting directly onto my LT headers and exhaust on the driver's side. Therefore the blue smoke. So I changed out the oil presure sender and power washed everything clean again. Well since then everytime the truck sits ideling at a light in gear or in park in the driveway it just simply STALLS. It shows no sign of when it's going to do it but about 9 out of 10 red lights it just simply stalls. Now when it does stall at a light while being in gear, if I throw it into neutral and try to start it, it won't. It just turns over and over. But if I put it into PARK it fires up right away. Now the truck has all new sensors on it, crank, cam, oil presure, TPS, IAC.......etc. Now when it stalls the key is still in the engine on position and the fuel pump stays running because I can hear it and the fuel presure stay at 32PSI on my AUTOMETER mechanical F/P gauge. The O/D light does go out when it stalls. Now today I removed every single plug/harness and inspected them and cleaned them out thouroughly with heavy duty electrical contact cleaner and then blew them out with low PSI compressed air. Still stalls. If I sit at a light and "TWO FOOT" it to keep it say at 1000RPM instead of my normal 750RPM in gear, then it won't stall. It only does it when it's on the idle curcuit. I'm going to try another IAC I have in the garage but I don't think it's that due to the other is brand new.

My question is, could it be in the ignition switch or the wire harness in the steering column? JMC and I will be checking this out tomorrow. Any other suggestion are welcome. The truck is 7 years old and I have been mechanically shifting it, it's whole life so the gear selector has some major "MILES" on it. I'm just wondering that with all the wear ans tear the steering column sees that it isn't a wire or contact in there that is worn.

 

HI!... Well JMC and I looked at it some more today. HIS palm pilot scanner will not communicate with my PCM for some reason but my X-CAL2 will? We tore the steering column apart and there was nothing wrong there. Re-checked all the harnesses and grounds. Nothing wrong there either. Were not pulling any codes off the PCM but got 3 codes off the instrument cluster today. They are :

1 - D027 = INVALID OR MISSING DATA FOR ENGINE RPM.

Tach works fine?

2 - D147 = INVALID OR MISSING DATA FOR VEHICAL SECURITY.

3 - D262 = MISSING SCP MESSAGE.

What the heck is SCP???

 

ill ask my dad when he gets home. does ur oil pressure drop drastically when u come to a stop?

 

DTC D262 - SCP Communication Bus Error

u might have a bad connection or a bad PCM...

check the PATS system...

 

HI!... PCM is new and all connections were checked and had continunity.

I believe it's the PATS moduale but there is no way to check it.

 

SCP is standard corporate protocol that means there is poor or not communication between the PCM,ABS,TCM,and all the other electrical control modules. STP. check the OD switch running through the steering sector as is comes out of the sector runs accross top of the steering colummn those will frey and short out. 2nd with oil leak on left side of engine the electrical connector for the transmission sector shaft is about 16-18pin connector(TRS transmission range sesnor). most probably is contaminated with engine oil or has died. dissconnect inspect also the brake master cylnder connector and check the cruise control connector. for oil contamination these all can cause problems such as u describe. after all this is checked clear the KeepAliveMemory.
that is what my dad said... so check that hes 99% of the time correct

 

The O/D switch was relocated to the dash. The Cruise on Neal's truck was removed years ago. Maybe some loose wires finally wore through and are touching metal. Truck was too hot to get under and play with the connectors on the tranny. Besides his truck is lowered and my "belly" doesn't fit.

JMC

 

lol excuses excuses drink some slim fast and loose that belly man.

 

HI!... It's not the O/D due to it was switched to a momentary switch and led light about 6 years ago and now is located in the radio surround. The TRS connector has already been checked and cleaned with electrical contact cleaner and all wire leading to it are fine, no cuts, frays, or burning. I have no cruise control on my truck. PCM memory has been reset about 15 times in the last 3 days.

 

even without the cruise control u still have the connector open somewhere correct?

 

hope you get the problem squared away niel...

you spend so much time on this and the results are no good...yet anyway

good luck bud..i'm sure you'll let us know how the adventure turns out...

...zap!

 

HI!... The connector that originally went to the C/C has been rtv'ed up and then electrical tape has been wrapped around it to fully insure it is totally sealed. There is only one wire coming from the C/C harness that is being used. It's a ground for the horns. The horns still work.

 

did u check the TRS connector yet?

 

HI!... That was the 1st thing I checked 3 days ago.

 

well the error codes show that some how the computers arent talking to eachother... so i guess ur best bet is to test ever computer and control module or tear the whole harness out of the truck and inspect...