Corsair231
Member
Eric,
This is a problem I'm chasing on my Sy. Occasionally on my Sy at warm idle I will get a code 44 (lean exhaust) and the idle will get rough. Sometimes the truck will even stall. My BLM will be at the upper end of the range which means the ecu is pulling fuel, correct? I have not found any vac or exhaust leaks. The O2 sensor cross counts seemed a little lazy so I changed the sensor. It helped but didn't cure the issue. The truck is driven enough that bad fuel shouldn't be the issue. Another typical cause is low fuel pressure but mine is actually a little high @50 line off and @40 line on with a stock non-adjustable regulator, but I did read somewhere that high pressure could cause it too but they didn't elaborate. I cannot understand how though so I figured it was a typo and it was supposed to read low fp. Have you ever any experience with this caused by high fp?
I've read it could also be a clogged or stuck injector. I've put a stethoscope to the injectors and they are all clicking like they should so is there anyway short of pulling the injectors to see if they are clogged? Could a clogged injector cause high fp? All of my other numbers (iac, tps, etc) seem to be about where they should be and all of the ignition parts to include the distributor itself are newish and seem to be in good order. Just a little transitional knock when I slam the pedal to go from cruise to wot.
Truck has good power and runs good otherwise so I didn't think I have any kind of fueling problem but I'm running out of ideas. I have thought about just upping the idle fuel in the chip but I don't want to crutch a problem that really needs to be fixed.
I've got another issue but I will put in in another post to keep from muddying the waters.
Thanks
This is a problem I'm chasing on my Sy. Occasionally on my Sy at warm idle I will get a code 44 (lean exhaust) and the idle will get rough. Sometimes the truck will even stall. My BLM will be at the upper end of the range which means the ecu is pulling fuel, correct? I have not found any vac or exhaust leaks. The O2 sensor cross counts seemed a little lazy so I changed the sensor. It helped but didn't cure the issue. The truck is driven enough that bad fuel shouldn't be the issue. Another typical cause is low fuel pressure but mine is actually a little high @50 line off and @40 line on with a stock non-adjustable regulator, but I did read somewhere that high pressure could cause it too but they didn't elaborate. I cannot understand how though so I figured it was a typo and it was supposed to read low fp. Have you ever any experience with this caused by high fp?
I've read it could also be a clogged or stuck injector. I've put a stethoscope to the injectors and they are all clicking like they should so is there anyway short of pulling the injectors to see if they are clogged? Could a clogged injector cause high fp? All of my other numbers (iac, tps, etc) seem to be about where they should be and all of the ignition parts to include the distributor itself are newish and seem to be in good order. Just a little transitional knock when I slam the pedal to go from cruise to wot.
Truck has good power and runs good otherwise so I didn't think I have any kind of fueling problem but I'm running out of ideas. I have thought about just upping the idle fuel in the chip but I don't want to crutch a problem that really needs to be fixed.
I've got another issue but I will put in in another post to keep from muddying the waters.
Thanks