Slight hesitation on quick revving
#1
03-19-2017, 09:56 AM
Slight hesitation on quick revving
Having replaced a faulty injector yesterday, Jesse is running great! Much smoother and a bit more power. Barked the tires by accident using my normal throttle demand.
But im going to try to get a small hesitation out of her today. By hesitation I don't mean she stumbles at all. In park engine warm a quick punch of the throttle shows a very brief delay before revving quickly and smoothly.
I know now that all my previous tweeking is likely needing to be rechecked after correcting the injector. The idle adjustment on the ECU has never been right. ECU seemed to see the miss as unburnt oxygen and rich up the mix then oscillate trying to solve its unsolvable mixture issue.
With all 12 firing properly hopefully I can meter that and get it set properly. Does anyone know if clockwise or counterclockwise is leaner?
The TPS will get rechecked because I always suspect it what else should I suspect?
But im going to try to get a small hesitation out of her today. By hesitation I don't mean she stumbles at all. In park engine warm a quick punch of the throttle shows a very brief delay before revving quickly and smoothly.
I know now that all my previous tweeking is likely needing to be rechecked after correcting the injector. The idle adjustment on the ECU has never been right. ECU seemed to see the miss as unburnt oxygen and rich up the mix then oscillate trying to solve its unsolvable mixture issue.
With all 12 firing properly hopefully I can meter that and get it set properly. Does anyone know if clockwise or counterclockwise is leaner?
The TPS will get rechecked because I always suspect it what else should I suspect?
#2
03-19-2017, 11:14 AM
Veteran Member
Join Date: Mar 2008
Location: Pacific Northwest USA
Posts: 24,743
Received 10,757 Likes
on
7,101 Posts
The idle adjustment on the ECU has never been right. ECU seemed to see the miss as unburnt oxygen and rich up the mix then oscillate trying to solve its unsolvable mixture issue.
With all 12 firing properly hopefully I can meter that and get it set properly. Does anyone know if clockwise or counterclockwise is leaner?
With all 12 firing properly hopefully I can meter that and get it set properly. Does anyone know if clockwise or counterclockwise is leaner?
I can't remember which way is lean vs rich.....and all my notes are 83 miles away with the car. I'll be going thru this process myself in a few days. Someone will come along soon with the answer.
I DO remember, from previous experience, that with every adjustment you should wait a minute or two for the system to respond and stabilize....but you probably already knew that
The TPS will get rechecked because I always suspect it what else should I suspect?
Make sure your throttles are clean and set to .002" gap and make very sure that the throttle linkages are *perfectly synchronized with no free play*. I've found this to be very important.
Cheers
DD
#3
03-19-2017, 11:29 AM
I can't remember which way is lean vs rich.....and all my notes are 83 miles away with the car. I'll be going thru this process myself in a few days. Someone will come along soon with the answer.
I DO remember, from previous experience, that with every adjustment you should wait a minute or two for the system to respond and stabilize....but you probably already knew that
Make sure your throttles are clean and set to .002" gap and make very sure that the throttle linkages are *perfectly synchronized with no free play*. I've found this to be very important.
Cheers
DD
I DO remember, from previous experience, that with every adjustment you should wait a minute or two for the system to respond and stabilize....but you probably already knew that
Make sure your throttles are clean and set to .002" gap and make very sure that the throttle linkages are *perfectly synchronized with no free play*. I've found this to be very important.
Cheers
DD
Man that really rang a bell for me! I always make sure to keep those throttle rods separate when I pull them off. Yesterday they got together and I wasn't sure which was which. When I put them back something felt off.
Im going to go swap them. I'll reset them if that doesn't bring things right.
#4
03-19-2017, 11:30 AM
Veteran Member
Join Date: Jul 2012
Location: Walnut Creek, California
Posts: 6,796
Received 2,399 Likes
on
1,880 Posts
Got them dialed in. Now for a test drive... 
#6
03-20-2017, 04:26 PM
Senior Member
I need to go through my linkage also as I have a hesitation from every stop. I know that somewhere on here is the total procedure. My question is about the .002 feeler gauge. What type of gauge are you using. A flat gauge of .002 will cause a gap of more than .002 due to the cord of the circle. I can't find any wire gauges that small.
Or maybe it doesn't mater that much as long as both are the same?
Or maybe it doesn't mater that much as long as both are the same?
#7
03-20-2017, 04:58 PM
I need to go through my linkage also as I have a hesitation from every stop. I know that somewhere on here is the total procedure. My question is about the .002 feeler gauge. What type of gauge are you using. A flat gauge of .002 will cause a gap of more than .002 due to the cord of the circle. I can't find any wire gauges that small.
Or maybe it doesn't mater that much as long as both are the same?
Or maybe it doesn't mater that much as long as both are the same?
The following users liked this post:
Grant Francis (03-20-2017)