Total Pageviews

Monday, October 22, 2012

chevy engine control stuff

Ok- so the engine runs good, but not great.  The symptoms are- it runs better after getting up to temperature, and between 2600 and 3000 rpm it kinda runs rough/ sputters until after 3000 rpms.
So after cruising the internet- I came upon the likely culprits- (in order of popularity)
1   O2 sensor    $45
2   coolant sensor (the intake manifold one - not the temp guage one between #1 &3 cylinders) $17
3   Throttle position sensor $44
4    map sensor  $??
5   electronic ignition timing in the distributor cap  $80 is the cheapest I've found.....
6    timing, timing chain, vaccuum leaks, wires, plugs, clogged fuel filter, fuel pump, fuel
      regulator, clogged fuel injectors, blah blah blah. 
too many parts- as simple as this fuel system is- the K.I.S.S. principle does not apply.

So I started on #1 and 2.  The revving problem went away almost immediately.
I also turned the timing up a few degrees which also helped- although after 3700 rpms there is
a little bit of popping coming from the passenger side exhaust.
I am going to change the thermostat to a 195 stock because if the engine doesnt get to temp the coolant sensor tells the computer its -40* outside.... duh
The original coolant sensor tested good- so its a spare. 

The jeep now has more power and will do a powerbrake burnout.

No comments:

Post a Comment