Rough idle and hesitation on acceleration
- Thread starter JEB91SY
- Start date
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Ok! So I adjusted the FP (lowered it) and in park it idles very well AFR's are 14.0-14.7.. Now driving around I have a pretty good hestitation under acceleration with the AFR's being really rich 10.9-11.5, and a slight flutter of 2-300 rpm but no where near the 5-800rpm I was getting before.. So this has me scratching my head:doh: .. I am runing the turbo time chip, so in the morning I will check to see if I set it right and swap in the stock to see if there is any change.. I also do get a dimming of the dash light on the rpm drop/surge which is leading me to think bad grounding some where, so Im going to do some more searching and see if I can come up with anything...
Aaron
Ok! So I adjusted the FP (lowered it) and in park it idles very well AFR's are 14.0-14.7.. Now driving around I have a pretty good hestitation under acceleration with the AFR's being really rich 10.9-11.5, and a slight flutter of 2-300 rpm but no where near the 5-800rpm I was getting before.. So this has me scratching my head:doh: .. I am runing the turbo time chip, so in the morning I will check to see if I set it right and swap in the stock to see if there is any change.. I also do get a dimming of the dash light on the rpm drop/surge which is leading me to think bad grounding some where, so Im going to do some more searching and see if I can come up with anything...
Aaron
dalwine250
Donating Member
Re: Rough idle and hesitation on acceleration
i had many of these same problems.it would go into herky-jerky mode.i'd replace the 02 and map,every thing was great.after 5-10 k miles it would start acting up again.after 2.5 years i found the lower intake gaskets where toast.not a problem since.
this is my understanding of wgat was going on.intake gasket leaks,comp reads lean.compensates throwing the truck rich.plugging up the o2.change it things where good for awhile..if the lower intake is bad on the top side,spray carb cleaner while engine running will find it.if its leaking on the bottom side,no way to tell until it comes apart.i was lucky,sprayed carb cleaner and found it.my gaskets had not deteriorated.there was a fold in the gasket and it was pushed down in the port during assembly .not sure if this will help anyone,i hope it does
dave
i had many of these same problems.it would go into herky-jerky mode.i'd replace the 02 and map,every thing was great.after 5-10 k miles it would start acting up again.after 2.5 years i found the lower intake gaskets where toast.not a problem since.
this is my understanding of wgat was going on.intake gasket leaks,comp reads lean.compensates throwing the truck rich.plugging up the o2.change it things where good for awhile..if the lower intake is bad on the top side,spray carb cleaner while engine running will find it.if its leaking on the bottom side,no way to tell until it comes apart.i was lucky,sprayed carb cleaner and found it.my gaskets had not deteriorated.there was a fold in the gasket and it was pushed down in the port during assembly .not sure if this will help anyone,i hope it does
dave
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Well I changed the IAT it was just filthy, no change. I pick up some carb cleaner and when the wind dies down I will try it on the upper intake. I did figure out that the only time I get the erratic idle is when I get into boost, if I stay out of boost everything is fine, but but after I get into boost things go south.. I emailed Mike Hood for some intake gaskets, and looks to be the next step, unless someone see's something I missed...
Well I changed the IAT it was just filthy, no change. I pick up some carb cleaner and when the wind dies down I will try it on the upper intake. I did figure out that the only time I get the erratic idle is when I get into boost, if I stay out of boost everything is fine, but but after I get into boost things go south.. I emailed Mike Hood for some intake gaskets, and looks to be the next step, unless someone see's something I missed...
2fast4u
PUMPING THAT IRON!
Re: Rough idle and hesitation on acceleration
I replaced the alternator about a month and a half ago... and then replaced it again 2 weeks ago... no change.. My problem is an actual combustion chamber miss.. Sometimes the tach needle will almost be steady.. but a few minutes later, its bobbin' between 650-850 rpm's at idle. Once i get past idle, it still has a miss, but its not nearly as noticeable, and my tach stays rock steady anywhere past 1000 rpms. It's weird. Like i mentioned earlier, The reluctor ring in my distributor seems loose to the touch. When i checked out a brand new dist. it did not have any play whatsoever. Also, you know what happens when an everyday car is out of time..it misses...uh huh. I think Supersport hit it right on the head. Tomorrow i will know more.. Talk to ya folks later. Wish me luck! :tup:
Rexxenexx said:This sounds like the time I had a bad regulator in the alternator. Any of you guys tried a friends alternator or watched you voltage? Maybe go get it bench tested for shits and giggles.
I replaced the alternator about a month and a half ago... and then replaced it again 2 weeks ago... no change.. My problem is an actual combustion chamber miss.. Sometimes the tach needle will almost be steady.. but a few minutes later, its bobbin' between 650-850 rpm's at idle. Once i get past idle, it still has a miss, but its not nearly as noticeable, and my tach stays rock steady anywhere past 1000 rpms. It's weird. Like i mentioned earlier, The reluctor ring in my distributor seems loose to the touch. When i checked out a brand new dist. it did not have any play whatsoever. Also, you know what happens when an everyday car is out of time..it misses...uh huh. I think Supersport hit it right on the head. Tomorrow i will know more.. Talk to ya folks later. Wish me luck! :tup:
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Well just an update.. I changed the upper and lower intake today and the fluttering idle and ocasional stalling have all stoped... Now I have a new problem and Im ready to drive the truck into Lake Mead.. I take the truck out after getting everything buttoned up and it runs great then all of a sudden I hear a ticking sound from behind the dash and the truck starts to shutter and falls flat on its face I have no idea what it is now.. Like I said I ready to drive into the lake... any ideas anyone???
Well just an update.. I changed the upper and lower intake today and the fluttering idle and ocasional stalling have all stoped... Now I have a new problem and Im ready to drive the truck into Lake Mead.. I take the truck out after getting everything buttoned up and it runs great then all of a sudden I hear a ticking sound from behind the dash and the truck starts to shutter and falls flat on its face I have no idea what it is now.. Like I said I ready to drive into the lake... any ideas anyone???
Flyin Ryan
hated cuz he drives fords
Re: Rough idle and hesitation on acceleration
So it turned out to be the lower intake gasket??
No idea what could tick behind the dash that would cause shutter though sorry
syclone1100 said:
So it turned out to be the lower intake gasket??
No idea what could tick behind the dash that would cause shutter though sorry
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Well all the electronics stay on with no dimming what so ever. Im gonna check and see if I have any lose connections any where, Im at loss for what this is...
Don W. said:
Well all the electronics stay on with no dimming what so ever. Im gonna check and see if I have any lose connections any where, Im at loss for what this is...
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Well how is this for an update I go out and try to figure out what is the deal, I go to start it and now it wont even turn over, it just cranks.. Fuel pressure is at 40 psi lights all work. the timming on the truck is ok. I dont know what the problem is and now its raining so I had to have it towed to a mechanic and have them look at it.. I will keep everyone posted...
Well how is this for an update I go out and try to figure out what is the deal, I go to start it and now it wont even turn over, it just cranks.. Fuel pressure is at 40 psi lights all work. the timming on the truck is ok. I dont know what the problem is and now its raining so I had to have it towed to a mechanic and have them look at it.. I will keep everyone posted...
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Just got word that the new distributor that got put in may of been bad, so that will get swapped with another new one and will go from there..
Just got word that the new distributor that got put in may of been bad, so that will get swapped with another new one and will go from there..
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Turns out the distributor was bad and that two plug wires were arching. all got fixed and the truck runs great:tup: . Driving home as I got off the freeway I hear a loud ticking from the motor like a sewing maching, good thing I was less than a mile from hone park it call a friend and he believes something in the valve train let go :banghead: :steamer: .. Well at least it ran good for a day before something else broke, well back to square one... If anyone has ??? about rough running and hesitation and this has been said before start with ignition starting with the plugs and work your way back to the distributor, and end with the intake gaskets...
Turns out the distributor was bad and that two plug wires were arching. all got fixed and the truck runs great:tup: . Driving home as I got off the freeway I hear a loud ticking from the motor like a sewing maching, good thing I was less than a mile from hone park it call a friend and he believes something in the valve train let go :banghead: :steamer: .. Well at least it ran good for a day before something else broke, well back to square one... If anyone has ??? about rough running and hesitation and this has been said before start with ignition starting with the plugs and work your way back to the distributor, and end with the intake gaskets...
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Done :tup:
sly dvl said:
Done :tup:
syclone1100
RUNNIN AND SELLIN
Re: Rough idle and hesitation on acceleration
Actually it was the intake gaskets that were the problem, after replacing both of those the major problems were fixed (stumbling, hesitation and stalling). After replacing the allready new distributor(with another new one) and the 3 plug wires, the misfires I was getting were taken care of as well..
Tooky said:
Actually it was the intake gaskets that were the problem, after replacing both of those the major problems were fixed (stumbling, hesitation and stalling). After replacing the allready new distributor(with another new one) and the 3 plug wires, the misfires I was getting were taken care of as well..