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99 ML430 with some issues.
I hate to rehash what's been said on another forum, but I'm not getting much input over there.
This started out with a P0170/P0173 CEL. I changed the MAF, but no luck. Recently, the truck has been sporadically running bad (loss of power, shuddering). Code check revealed the same two codes, accompanied by P0300, P0305, P0306, P0307 and P0308. I found it strange that all these codes were on one side of the engine; however, I replaced the plugs and wires. I had a tech look at the truck when I had all the codes popping and he recommended plugs, wires and a throttle actuator. He said my MAF appears to be fine. Since then, I have the P0170 and P0173 codes. I purchased an Actron CP9180 Autoscanner and checked the live data. This is what I got: These values were taken after the codes had been cleared. Here's a printout of my values at idle, upon startup: MIL STATUS OFF ABSLT TPS % 2.7 ENG SPEED RPM 651 CALC LOAD % 20.3 MAF FLOW g/Sec 5.55 MAP KPA 29 COOLANT F 208 IAT F 165 IGN ADVANCE -13.6 SECOND AIR ATMOS ST FTRM1 % -1.0 LT FTRM1 % 16.4 ST FTRM2 % -2.2 LT FTRM2 % 17.1 VEH SPEED MPH 0 FUEL SYS 1 CLSD FUEL SYS 2 CLSD O2S11 V 0.785 ST FTRM11 % -2.2 O2S12 V 0.780 O2S21 V 0.100 ST FTRM21 % -2.2 O2S22 V 0.065 This is a record of the values after approximately one minute at idle: MIL STATUS OFF ABSLT TPS % 2.3 ENG SPEED RPM 659 CALC LOAD % 20.0 MAF FLOW g/Sec 5.41 MAP KPA 29 COOLANT F 208 IAT F 167 IGN ADVANCE -13.6 SECOND AIR ATMOS ST FTRM1 % 0.7 LT FTRM1 % 16.4 ST FTRM2 % -4.6 LT FTRM2 % 17.1 VEH SPEED MPH 0 FUEL SYS 1 CLSD FUEL SYS 2 CLSD O2S11 V 0.155 ST FTRM11 % 0.7 O2S12 V 0.755 O2S21 V 0.210 ST FTRM21 % -1.0 O2S22 V 0.070 I took the truck for a drive (approximately 1/2 hour) and she threw the CEL again, upon startup. Here is a read out of the freeze frame event: Frame 1 Mod $01 TROUB CODE P0173 ENG SPEED RPM 650 CALC LOAD % 26.6 MAP KPA 36 COOLANT F 195 ST FTRM1 % -11.8 LT FTRM1 % 16.4 ST FTRM2 % -13.3 LT FTRM2 % 17.1 VEH SPEED MPH 0 FUEL SYS 1 CLSD FUEL SYS 2 CLS Can anyone point me in the right direction? BTW: After resetting the codes, the truck drives fine, sometimes for a day or so, before the P0173/P0170 return. If it was the MAF, wouldn't the problem raise its ugly head almost immediately? Could this symptom be indicative of a fuel pump/regulator/filter problem? Last edited by piperca; 05-06-2007 at 11:16 PM. |
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