03 chevy express p0101 code

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

hello,
i have a 03 chevy express 3500 auto 6.0 180000 miles well taken care of
problem is when its cold outside and on start up runs rough and gradully smooths out after its warm .the only code i have is p0101 and i just pulled the air box apart and cleaned the mass air sensor with electric spray cleaner and still the same problem.the van runs good while driving and i have not noticed any surging or fuel milege drop.
any info would be great
thankyou
Joe

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chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

I now have 2 other codes comming up they are p0141 and p0147
lean in bank 1 and 2
still cant figure out what the deal is!!

jeff compton · **Posted:** Mon Feb 05, 2007 1:58 pm

check for correct fuel pressure! check for a vaccum leak from the intake gasket area, check the snorkel for the MAF, check the MAF to be sure even that it's clean that the reading it's generating is accurate! Check the egr system

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

Jeff,
Thankyou for the response,here is a snap shot of the data list for the van
AB SLT TPS 0.0
CALC LOAD 1.2
COOLANT TEMP 183
RPM 548-572
FUEL SYS 1 CLOSED
FUEL SYS 2 CLOSED
IAT 25-27
IGN ADV 12-16
LT FL TRM 1 25.00
LT FL TRM 2 25.00
MAF .43
MAP 11.5
OBD STATUS OBD1
O2S BNK 1 % 1.96-2.35
O2S BNK 1 V .025-.030
O2S BNK 2 % 6.27-6.67
O2S BNK2 V .080
O2S BNK 2#1 V .020-.025
O2S BNK 2%1.57-1.96
O2S BNK 2 #2 % 6.27
O2S BNK #2 V .080-.090
ST FL TRM 1 % 51.6
ST FL TRM 2% 51.6

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

I checked for vacume leaks and could not find any, i also used starter fluid to spray on the intake runners and matting areas and had no change in idle. i used a fuel pressure guage and got a reading of 50psi steady at idle and when i depressed the release button on the gauge it held at 42 psi while running. I dont know where the snorkle is located but sprayed either on the air box at all connections and it didnt change idle.how do you check the egr?
thanks again
Joe

jeff compton · **Posted:** Tue Feb 06, 2007 12:36 pm

the give away here is your short and long term fuel trims, the fuel pressure sounds too low? Has the fuel pump ever been changed?

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

the 50 psi reading is taken from the fuel rail.what should the reading be ?
also is the maf sensor working properly from data list.the fuel pump is the factory one ,it doesnt hum or make any excessive noise.
thanks again

Joe

jeff compton · **Posted:** Wed Feb 07, 2007 9:30 am

fuel pressure should be 55-62 with the key on engine off and 45-59 at idle!
I've seen a few tsbs for your van that describe similar symptons that all point to replacing the MAF but low fuel pressure can generate those codes and fuel trims as well! Try running it with the MAF disconnectted and see what the fuel trims do!

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

Jeff
I unpluged the mass air sensor when the vehicle was warmed up and it idled smooth the flt trim dropped to 15.6 for slt trm bnk 1@2
the lower slt #s jumped around in the -.08thru3.6
what do you think?
thanks again
Joe

jeff compton · **Posted:** Thu Feb 08, 2007 7:18 am

I'd say try a new MAF!

chevyexpress03 · **Joined:** Sun Feb 04, 2007 7:05 pm **Posts:** 10

Jeff,
I Installed a napa re-man mass sensor today and it took care of the rough idle!! However I cleared out all the codes and still after running it for a few hours i get codes back p0141 and p0147.
what else could be wrong?
Thanks again
Joe

jeff compton · **Posted:** Mon Feb 12, 2007 8:28 am

blown fuse for the 02 sensor heater circuit maybe!

03 chevy express p0101 code

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