Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Past Chevy Truck, SUV & Vans > S-10 & Blazer
Sign in using an external account
Register Forgot Password?

S-10 & Blazer 1982-2005
The S-10 and Blazer was arguably the most versatile and accessorizable mid-size truck and SUV on the market.
Platform: S/T-series & GMT 330

LinkBack Thread Tools
Old 06-12-2009, 08:59 PM
CF Beginner
Join Date: Jun 2009
Posts: 7

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??
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
Old 06-14-2009, 05:46 AM
mudmaniac's Avatar
Super Moderator
Ride of the Month
May 2009
1987 Chevrolet K Blazer
My Garage
Join Date: Jan 2008
Location: Westminster, Md.
Posts: 1,640
Send a message via Skype™ to mudmaniac

Originally Posted by suzuki-guy View Post
There is a way to test the mapsensor! Do you have a Haynes manual? Mudmaniac how do adjust TPS? I don't think I did that when I replaced mine?
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.

Helpful Site Usage articles:

Vote in the May TOTM Contest
How To Post a Signature
How To Create a Photo Gallery
Posting Links, Images, etc. Using BB Code Tags
NEW!! Create your own garage!

95 Tahoe 383cu.in./350hp/425ftlbs
6" lift 16x35x16 Boggers
Reply With Quote
Old 06-14-2009, 09:35 PM
CF Beginner
Join Date: Jun 2009
Posts: 7

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
Reply With Quote
Old 06-14-2009, 09:35 PM

1995, 95, blazer, camshaft, circuit, control, idle, ignition, malfunction, map, module, position, rough, sensor, silverado

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

Join Chevroletforum
Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 10:58 PM.

Internet Brands, Inc.

Emails Backup