Hesitation below 2000rpm
Thread Starter
|
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
Hesitation below 2000rpm
Hey guys, bike is a 2022 low rider ST
Heres the following mods
-wood 22xe camshaft
-wood directional lifters
-fuel moto PV4 tune
-5.5g/S SE fuel injectors
-fuel moto push rod kit
-SE billet oil pump/cam plate
-SE 55mm aluminum intake manifold
-s&s billet fuel rail
-stock heavy breather intake
-SPB fab 2 into 1 short exhaust
-SE spark plugs
-ccv routed to atmosphere
my problem is, it has developed a hesitation around 2000rpm. Its not constant, its intermittent. I feel it when Im taking off and I also feel it when I shift gears. It bogs for a second or two then picks right up like nothing is wrong. If I ride aggressive, it runs like a raped ape. There is no codes. I found fuel pressure to be high 66-68psi when it should be 54-62psi. I put a buddys whole fuel tank on my bike that was making 62psi to rule out fuel delivery and it still did the problem. My oil seems to smell a bit like fuel and the exhaust smells rich.
so far I have done the following;
-replaced injectors
-replaced intake manifold seals along with all the seals on the intake itself
-replaced plug wires with SE fat wires
-tried a buddys gas tank
-cleaned air filter and whole intake system
-replaced TMAP sensor
I have my tank off at the moment and Im replacing the filters, strainer and regulator because of the high pressure. Im also going to take the screamin eagle plugs out and throw a set of stock ones in to try. After that the only thing I can see it being is tune.
any insight? It has anyone else had an issue similar? Once I get it fixed Ill be sure to post back with solution .
Heres the following mods
-wood 22xe camshaft
-wood directional lifters
-fuel moto PV4 tune
-5.5g/S SE fuel injectors
-fuel moto push rod kit
-SE billet oil pump/cam plate
-SE 55mm aluminum intake manifold
-s&s billet fuel rail
-stock heavy breather intake
-SPB fab 2 into 1 short exhaust
-SE spark plugs
-ccv routed to atmosphere
my problem is, it has developed a hesitation around 2000rpm. Its not constant, its intermittent. I feel it when Im taking off and I also feel it when I shift gears. It bogs for a second or two then picks right up like nothing is wrong. If I ride aggressive, it runs like a raped ape. There is no codes. I found fuel pressure to be high 66-68psi when it should be 54-62psi. I put a buddys whole fuel tank on my bike that was making 62psi to rule out fuel delivery and it still did the problem. My oil seems to smell a bit like fuel and the exhaust smells rich.
so far I have done the following;
-replaced injectors
-replaced intake manifold seals along with all the seals on the intake itself
-replaced plug wires with SE fat wires
-tried a buddys gas tank
-cleaned air filter and whole intake system
-replaced TMAP sensor
I have my tank off at the moment and Im replacing the filters, strainer and regulator because of the high pressure. Im also going to take the screamin eagle plugs out and throw a set of stock ones in to try. After that the only thing I can see it being is tune.
any insight? It has anyone else had an issue similar? Once I get it fixed Ill be sure to post back with solution .
Last edited by evildiesel; Sep 2, 2024 at 10:16 AM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 5,465
Likes: 625
I would have looked at the tune before replacing anything. Can you data log with the PV4? If so, I would run some data logs until you get it do stumble. Send those logs to Full Moto. I bet they can straighten it out.
Zach
Zach
Thread Starter
|
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
This is my next step. It just kind of happened out of no where so I didnt suspect the tune. There really isnt anything left, other than o2 sensors or the throttle body, but Im sure either one of those would set off a code.
Thread Starter
|
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
I thought the same thing, but the fuel smells made me think the other way around.
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
does it burble around town nicely between 1500 and 2000 revs... my stock one does.
2 into 1 short exhaust and tune? would be a guess looking at others dyno charts and experience
2 into 1 short exhaust and tune? would be a guess looking at others dyno charts and experience
Trending Topics
Thread Starter
|
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
Yes, but at first itll studder then run smooth.
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
6 Weirdest Harley-Davidsons Ever Sold to the Public
Verdad Gallardo
7 Times Harley-Davidson Chucked Tradition Out the Window
Verdad Gallardo
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Verdad Gallardo
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
Road Warrior
Joined: Jun 2015
Posts: 1,325
Likes: 140
From: Edinburgh UK
By "FM tuned" - what do you mean
Base map supplied, or
Base map supplied and copious logs and FM adjusted it for you
Either way it sounds like more of the second is needed, as mentioned above. But 2-1 can cause nasty dips around those revs if not tuned well if you have a look at others charts
Base map supplied, or
Base map supplied and copious logs and FM adjusted it for you
Either way it sounds like more of the second is needed, as mentioned above. But 2-1 can cause nasty dips around those revs if not tuned well if you have a look at others charts
Thread Starter
|
Tourer
Joined: Jan 2022
Posts: 318
Likes: 228
From: Ontario
By "FM tuned" - what do you mean
Base map supplied, or
Base map supplied and copious logs and FM adjusted it for you
Either way it sounds like more of the second is needed, as mentioned above. But 2-1 can cause nasty dips around those revs if not tuned well if you have a look at others charts
Base map supplied, or
Base map supplied and copious logs and FM adjusted it for you
Either way it sounds like more of the second is needed, as mentioned above. But 2-1 can cause nasty dips around those revs if not tuned well if you have a look at others charts