acceleration stumble in 2nd gear

4626 Views 14 Replies 7 Participants Last post by shinyballs, 6 mo ago

Big Dawg

Discussion Starter · Feb 6, 2015

As some of you know I've been chasing the ghost noise in my 07 V2K classic lt.
So I swapped out the motor with another 07. Noise is better (audible) but still the same. But I need some help with a 2nd gear stumble with this new/used motor. 2nd gear moderate to heavy acceleration stumbles at 35 mph everythime. No issues in any other gears. Low easy roll on no issues at all.

I've unplugged the speed sensor to force the ecu into thinking its always in fifth gear, with no results. Did the same with the gear position sensor with no results.

Any ideas...

1 - 15 of 15 Posts

hayes

· #2 · Feb 7, 2015

That's the same issue I had. Bent shift fork.

Big Dawg

Discussion Starter · #3 · Feb 7, 2015

Hayes, can you give me some details? And how you or your tech determined it to be a bent shift fork?

Thanks for any insite you can offer.. This motor is still under a 60 day used warranty.. So I need to decide if it's an easy fix or it gets pulled and returned..

thanks again,

wrenchjockey

· #4 · Feb 7, 2015

a stumble or lurching starting as the power goes on and gets worse as revs build is very likely shift fork/rounded drive dogs in gearbox.

Big Dawg

Discussion Starter · #5 · Feb 7, 2015

Just to be clear. It only stumbles in 2nd doing a hard acceration and always at 35 mph? It's only one quick buck and then its perfect? I can not duplicate this in any other gear or speed. Can this still be a bent shift fork?

wrenchjockey

· #6 · Feb 8, 2015

possibly not. usually gears (drive dogs) slipping gets worse as the power builds. are you sure its not an ignition miss?

Big Dawg

Discussion Starter · #7 · Feb 8, 2015

Ignition miss, Is the direction I've been leaning. But wanted to hear from others with more experiance than I. Also if anyone had any thoughts as how to trace the problem. Thanks wrenchjockey for your input.

hayes

· #8 · Feb 8, 2015

Big Dawg said:
Just to be clear. It only stumbles in 2nd doing a hard acceration and always at 35 mph? It's only one quick buck and then its perfect? I can not duplicate this in any other gear or speed. Can this still be a bent shift fork?

This is the problem I had. The mechanic knew as soon as I described. I didn't mind because I had an internet diagnosis from Racnray with the same outcome.

Big Dawg said:
Ignition miss, Is the direction I've been leaning. But wanted to hear from others with more experiance than I. Also if anyone had any thoughts as how to trace the problem. Thanks wrenchjockey for your input.

Mine was only once and only in 2nd gear. An ignition miss would be constant because the ignition would keep missing (in my opinion). You can read about it here.

RuaphuNZ

· #9 · Feb 9, 2015

hayes said:
You can read about it here.

Good read Mr H, the only thing that had be perplexed was a comment about a hollow point? wtf is it and how would it have helped?

Ando

davidr

· #10 · Feb 9, 2015

It was a joke. Hollow point bullet.

hayes

· #11 · Feb 9, 2015

RuaphuNZ said:
Good read Mr H, the only thing that had be perplexed was a comment about a hollow point? wtf is it and how would it have helped?

Ando

It was a play on troubleshooting and trouble shooting. Like diagnosing (troubleshooting) and shooting with a gun (I was having trouble shooting [with a gun]).

RuaphuNZ

· #12 · Feb 9, 2015

hayes said:
It was a play on troubleshooting and trouble shooting. Like diagnosing (troubleshooting) and shooting with a gun (I was having trouble shooting [with a gun]).

Ahhh, yeah I did the google thing later on wondering what it was, heck i didn't realise it was bullets, haha.

Big Dawg

Discussion Starter · #13 · Feb 9, 2015

I just wanted to thank everyone for their input....this is a great forum with a lot of people..

Larryissatan

· #14 · 6 mo ago

Big Dawg said:
Just to be clear. It only stumbles in 2nd doing a hard acceration and always at 35 mph? It's only one quick buck and then its perfect? I can not duplicate this in any other gear or speed. Can this still be a bent shift fork?

My '07's been doing the similar thing and straight bogs and lurches like the guy was saying and it only started doing it after I had it painted and the tank wasn't covered right and so it clogged the filter and I changed the filter and pump and everything out and it still does it I pulse cleaned the injectors and for the life of me I cannot trace down the problem. What ended up being the problem on yours?

shinyballs

· #15 · 6 mo ago

My '04 misses on second gear too under hard acceleration. I was told, bent fork or worn dogs or both. It is not an easy or cheap job.

1 - 15 of 15 Posts

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