Question about Chevrolet Chevy
My check ingine light has come on. Noticed a hesitation "grabbing" at 45mph. A friend used a code reader and it indicated an exhust cam overspeed. What does this mean?
Prob a build up in cat converter can cause a back pressure slowing down escape of exhaust gases from engine you can get a catalytic converter cleaner to add to fuel tank ,give it a go as a cheap starting point expect it too take a full tank of fuel before it clears check the instruction on product
Posted on Mar 26, 2014
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Posted on Jan 02, 2017
You could have a restriction in the egr ports. remove the valve. Plug the holes, start engine. 1 hole will be blowing out exhaust, the other will have large vacuum.
Posted on Mar 28, 2009
SOURCE: speedometer erratic/intermittent
I don't know what is causing this problem, but I know phil140701's answer is completely wrong on two counts. First, 740 Volvos starting at least in 1986 have electronic speedometers and no cable. There is an electronic sensor on the differential which sends a signal to the speedometer cluster. Second, if it were strictly mechanical with a cable then the voltage regulator could have no effect on it at all.
Posted on Sep 01, 2009
P174 means Oxygen sensor was slow in switching Single, Right
or Rear HO2S - Fuel control
P171 means Oxygen sensor not switching - system was at adaptive limits - Single, Right or Rear HO2S - Fuel control
for a comprehensive code listing for your car.
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Posted on Jan 08, 2010
p1391 is intermitant loss of signal from crank sensor and cam sensor--change sensors!! change cam sensor first. good luck!! then try it, if still same way. change crank sensor.
Posted on Nov 26, 2010
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