rough running

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  #1  
Old 12-06-07, 01:50 PM
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rough running

95 s15 jimmy 4.3 4*4 208000miles started running rough and stalling when slowing for red lite found pcv hose kinked bought new hose vaccum good but same could it be just coincedence or can motor be going didnt mention cat rattles and could be plugged but drives fine any help would be in order as N.E winter coming
 
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  #2  
Old 12-06-07, 01:52 PM
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A lot of "could be"s, but check the EGR valve for closing.
 
  #3  
Old 12-06-07, 03:39 PM
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should the egr be closing with engine running or off
 
  #4  
Old 12-06-07, 04:06 PM
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It would be closed with the engine off = all the time. However, it opens and closes at different times during the running of the engine relative to emissions. If it was at fault in your situation, it would be opening (probably when it was supposed to) but sticking open or not fully closing when it was supposed to = engine dieing. They get plugged up with carbon since they introduce exhaust into the intake to lower combustion temperatures.

Your problem could also be a MAP sensor since they trigger at high intake manifold pressure = when engine is braking.

Hope this helps,

Bob
 
  #5  
Old 12-06-07, 05:16 PM
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egr location , is it just under throttlebody? is electric says need special equitment at dealer this truck is a 95 with obd11 where they say is on 96 and newer im not good w diagin cars but bare good w hands basic
 
  #6  
Old 12-06-07, 05:38 PM
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Yes, it's just under the throttle body. The actuation of it is by vacuum through the diaphragm that sits piggy back on the valve. The vacuum is regulated through a vacuum valve which is sensor driven. The vacuum valve would have an electrical solenoid.

The sensors have to be checked with diagnostic equipment, but you can remove and clean the EGR valve yourself.
 

Last edited by marbobj; 12-06-07 at 07:03 PM.
  #7  
Old 12-07-07, 04:10 AM
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i shall give it a go when temp hopefully gets around 35plus degrees will let u no when i try it thank you for now
 
  #8  
Old 12-07-07, 06:56 PM
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Talking update

to marbobj THANK YOU it was both throttle body and egr tbody needed serious clesning removed egr was gunked up causing torx to stick cleaned the snot out of it reinstalled mean while i lost a snap on 10m somewere and about an hour trying to find one of the egr bolts it fell and hid realy good till shear luck found it weather was around 40 deg this after and finished exact same time it started to rain thank you again kvn4
 
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