95 Blazer rough idle
#11
Ok I'm starting to think that I may have a VCM problem, SES light came on today so I pull out the Tech 2 scanner and DTC PO134 Heated oxygen sensor No activity detected B1 Ssensor 1 so I pull out the meeter and disconect the O2 sensor Reference Voltage is supposed to be .45volts and as low as .32 volts depending on the meter used Mine is .26-.28
on both sensors so check connectors wiggle them around with no change,clear the DTC to see if it will happen again. I take the truck for a ride and the service light SES light is back on again check DTC with scanner and have 3 more stored PO340 camshaft position sensor
circuit malfunction, PO441 Evap system incorrect purge flow, and P1406 EGR pintle position error My EGR is 1 week old with it throwing all these codes and a lower than allowed reference voltage on my O2 sensors I think my truck needs a new brain because although i still have a rough idle the truck runs like New
Any thoughts??
on both sensors so check connectors wiggle them around with no change,clear the DTC to see if it will happen again. I take the truck for a ride and the service light SES light is back on again check DTC with scanner and have 3 more stored PO340 camshaft position sensor
circuit malfunction, PO441 Evap system incorrect purge flow, and P1406 EGR pintle position error My EGR is 1 week old with it throwing all these codes and a lower than allowed reference voltage on my O2 sensors I think my truck needs a new brain because although i still have a rough idle the truck runs like New
Any thoughts??
#12
Super Moderator
Ride of the Month
May 2009
Ride of the Month
May 2009
There are a couple different types of TPS, one of them fits over the cross shaft end and another has a tab at the end of the shaft. They both have very limited adjustment before you tighten the mounting screws. It should be at .65 volts when idling and 5 volts at WOT. The Holley TB has a much easier adjustment and an idle adjustment screw as well.
#13
Ok fixed the Multiple DTC's replaced fuse #5 for O2 EGR and Evap codes
Gonna change fuel filter and tune up tomorrow and hopefully rough idle goes away but have ordered a new MAP sensor and IAC from rock auto other than the ICM that's the last original 95 parts left on the vehicle and both can affect idle
Gonna change fuel filter and tune up tomorrow and hopefully rough idle goes away but have ordered a new MAP sensor and IAC from rock auto other than the ICM that's the last original 95 parts left on the vehicle and both can affect idle
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JLBailey93
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April 22nd, 2011 9:41 PM