96 5.9 Occasional Hard Start
#1
96 5.9 Occasional Hard Start
Truck specs are in my sig.
I am having an intermittent start up problem.
When cold startup seems fine, then drive it enough to get it up to normal running temp,
shut it off and 10 minutes later go to start it up, longer crank time and sluggish startup.
It runs great once I get it started.
I have noticed that the idle is a bit low lately, at times.
Not getting a CEL
Looking for suggestions for where to start looking,
all help will be appreciated !
I am having an intermittent start up problem.
When cold startup seems fine, then drive it enough to get it up to normal running temp,
shut it off and 10 minutes later go to start it up, longer crank time and sluggish startup.
It runs great once I get it started.
I have noticed that the idle is a bit low lately, at times.
Not getting a CEL
Looking for suggestions for where to start looking,
all help will be appreciated !
#2
#3
I'd say check your fuel pressure during hard start first. Next, look into the evap emissions circuit. A good place to start (forgive the punn) is to remove the gas cap n see if there is a giant sucking sound. Take the gas cap off n see if the pickup gets any easier to start. The evap lines may be clogged, disconnected or your vapor purge tank is full or raw fuel. Put your hand or some form of metal stethoscope on the evap valve and listen or feel for a clicking noise, it should click. If it's not clicking, then it could be stuck open and your gas tank is undergoing a slow n steady vacuum buildup during warmup operations and the fuel pump can no longer overcome the vacuum until it once again slowly bleeds off after sitting for awhile. Last but certainly not least, if the fuel delivery is good, check ye 'ol cat for clogging n peer down the intake thru the throttle body to see if your plenum floor is a swimming pool of oil.
#4
#5
I'd say check your fuel pressure during hard start first. Next, look into the evap emissions circuit. A good place to start (forgive the punn) is to remove the gas cap n see if there is a giant sucking sound. Take the gas cap off n see if the pickup gets any easier to start. The evap lines may be clogged, disconnected or your vapor purge tank is full or raw fuel. Put your hand or some form of metal stethoscope on the evap valve and listen or feel for a clicking noise, it should click. If it's not clicking, then it could be stuck open and your gas tank is undergoing a slow n steady vacuum buildup during warmup operations and the fuel pump can no longer overcome the vacuum until it once again slowly bleeds off after sitting for awhile. Last but certainly not least, if the fuel delivery is good, check ye 'ol cat for clogging n peer down the intake thru the throttle body to see if your plenum floor is a swimming pool of oil.
Not quite 2 years ago I installed a new Carter brand fuel pump from Rock Auto.
Last edited by Ramchu; 03-15-2018 at 11:17 AM. Reason: additional info
#6
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#8
It's been my experience that the TPS is either good, bad or has a bad "spot". I've yet to see a bad one myself, even in upstate NY. If you have a volt/ohm meter you can do a resistance check to rule it out, it'll behave like a potentiometer on an old analog style radio. It won't be effected by temperature. However, there's always a first time for everything.
#9
Haven't been able to duplicate the problem again to this point.
Just stopped by the local parts store and picked up the stuff to
give the throttle body a good cleaning, a dirty IAC could be the
causing the slightly low idle and at 164,000 + miles , I'm sure
that it won't hurt.
Thank's for all of the replies, I'll keep this updated when I find
something out.
Just stopped by the local parts store and picked up the stuff to
give the throttle body a good cleaning, a dirty IAC could be the
causing the slightly low idle and at 164,000 + miles , I'm sure
that it won't hurt.
Thank's for all of the replies, I'll keep this updated when I find
something out.
#10