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Code 12 runs rough idles rough 94 4.3 chevy blazer replaced o2 and coolent temp.

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2006 Chevy Trailblazer started to run rough in idle but only after it warms up. My mechanic got P0017 code on his scan tool and told me I needed to replace the Crankshaf and Camshaft sensors. Both sensors...


Bad coolant temp sensor or EGR valve stuck. You can remove and test temp sensor (the one for the ECM--has only one wire) using cold and then hot water and read resistance with ohm meter.

Jan 28, 2015 | 2006 Chevrolet Trailblazer Ext

1 Answer

Car: 94 Chevy caprice, 5.7L engine/port fuel injection Problem: very hard cold starts, rough idle at cold temperatures and stalling at low idle(when able to start after minutes of continuous cranking)...


Have your temp sensor checked. It may not be setting off a code but a sign of a failing temp sensor is hard starts, rough idle, until the car heats up. It sends a code to the ECM to help adjust fuel mixture. If it sends gals readings, the computer will adjust the fuel-air ratio and cause vehicle to run too lean until warmed up. Some people have had to keep pumping the gas pedal to keep it going from a bad temp sensor.

Oct 14, 2017 | Cars & Trucks

2 Answers

My 01 chevy blazer will idle rough. it gives me error codes, p0300 and p0135 and p0141. where do i find these problems


Hello your po135 is o2 sensor bank 1 your po141 is O2 sensor bank 1 sensor 2 and your pO300 is random multiple cylinder misfire these problems are your oxygen sensors and engine misfire pO300 is you engine missing o2 sensors are switches in the exhaust system the engine misfires are the engines cylinders missing.

Jan 05, 2011 | 2001 Chevrolet Blazer

1 Answer

1985 Chevy: I have a 1985 2.8L chevy 4x4 Blazer I just re...


All GM have ignition coil problems , your getting too much fuel , I have seen O2 sensors and plugged catalytic mufflers too many times , be careful the next ride the vehicle will catch on fire..Try the coil first

Apr 14, 2017 | 1985 Chevrolet Chevy

1 Answer

Engine misses bad at idle often stalls, runs ok


Code 12 isnt going to tell you anything. Find out what cylinders are misfiring and go from there.

Nov 15, 2009 | 1994 Chevrolet S-10 Blazer

2 Answers

93 blazer runs better when check engine light's on


Could be a temp sensor or similar too, and believe it or not, the price to have the vehicle scanned for codes, and fuel pressure tested if necessary, usually ends up being cheaper in the long run, rather than play hit & miss, and replace a bunch of parts by guessing.

Dec 11, 2008 | 1993 Chevrolet S-10 Blazer

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