Vibration at low rpms...I'm lost! - Ford Powerstroke Diesel Forum

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post #1 of 24 Old 01-16-2010, 07:24 PM Thread Starter
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Question Vibration at low rpms...I'm lost!

So long time reader first time poster. Had a 7.3 back in 04 and just bought my second. Its a early 99 SC LB 4x4 with 130k miles. Anyways the truck has a weird vibration only in a certain rpm range.

You can mostly feel it in 3rd and 4th when the engine lugs between 1300 and 1800 rpm. The vibration gets worse the more throttle I apply, when I let off it goes away. You can feel it in the whole truck but steering wheel shakes kinda bad also. I can also feel it a little in reverse. It wouldn't bother me but the vibration feels like its gonna break some tranny or motor mounts.

I've searched and read it could be anything from a bad injector to a torque converter shutter, but nobody posts if they resolved the problem. Has anyone had and resolved this issue? I'm getting kinda desperate but would hate to change the TC and it doesn't solve it. Any help is much appreciated and I'm glad to be back in the powerstroke family.
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post #2 of 24 Old 01-17-2010, 05:33 AM
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My truck does the exact same thing. my tranny and tc are new(less than 500 miles) if i drive mine for a while it will go away most the time but we did the cyl contribution test and my 3 & 8 injectors show to be bad. have you ran any test on it?

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post #3 of 24 Old 01-17-2010, 02:19 PM Thread Starter
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No I haven't done any tests yet. I just got the truck a few days ago. I've read multiple solutions to this problem, but the most common was injector related. Do you plan on replacing those injectors anytime soon?
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post #4 of 24 Old 01-17-2010, 02:52 PM
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Quote:
Originally Posted by slopoe View Post
My truck does the exact same thing. my tranny and tc are new(less than 500 miles) if i drive mine for a while it will go away most the time but we did the cyl contribution test and my 3 & 8 injectors show to be bad. have you ran any test on it?
Those injectors read bad with a grey cps
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post #5 of 24 Old 01-17-2010, 02:57 PM
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Yes my new ones will be here tom. #3 read bad before ford did the cps recall then wk later 3 & 8 showed bad. Should i only replace 3?

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post #6 of 24 Old 01-18-2010, 12:12 AM Thread Starter
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Originally Posted by slopoe View Post
Yes my new ones will be here tom. #3 read bad before ford did the cps recall then wk later 3 & 8 showed bad. Should i only replace 3?
After you've. Installed them please let me know if it helps at all.
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post #7 of 24 Old 01-18-2010, 12:22 AM
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If there is a stroke on the road that still hasn't had the cps upgrade then someone has been out of touch with civilzation. since you just bought the truck i would o strait to the for house to get it replaced and see about gettin a cylender contrubution test run as soon as the new one is in. alot of these ford techs are prettty cool and eager to share their knowledge.

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post #8 of 24 Old 01-18-2010, 02:34 PM
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Installed my new injector in #3 today seems to have taken care of my miss did put the#8 in yet because it got broke during shipping but i will keep ya posted on how it does tom when its cold

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post #9 of 24 Old 11-19-2012, 05:44 AM
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Quote:
Originally Posted by Justin.Hutch View Post
So long time reader first time poster. Had a 7.3 back in 04 and just bought my second. Its a early 99 SC LB 4x4 with 130k miles. Anyways the truck has a weird vibration only in a certain rpm range.

You can mostly feel it in 3rd and 4th when the engine lugs between 1300 and 1800 rpm. The vibration gets worse the more throttle I apply, when I let off it goes away. You can feel it in the whole truck but steering wheel shakes kinda bad also. I can also feel it a little in reverse. It wouldn't bother me but the vibration feels like its gonna break some tranny or motor mounts.

I've searched and read it could be anything from a bad injector to a torque converter shutter, but nobody posts if they resolved the problem. Has anyone had and resolved this issue? I'm getting kinda desperate but would hate to change the TC and it doesn't solve it. Any help is much appreciated and I'm glad to be back in the powerstroke family.

Did you ever find the problem? My truck is doing the same thing. My trans mission is under warranty, so dealer tried to fix the problem. They installed a new solenoid pack, new torque converter, then a new rebuilt transmission. None of this fixed the vibration. Told me the vibration was not transmission related. Trying to find out where to look next. Any suggestions much appreciated.

2002 F250 CCSB Lariet 7.3 Auto
2" helper springs 285/75R16 Toyo M/T
80 gallon fuel tank in bed
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Ford Transmission @ 407,425 miles 3/24/12
Full Force Injectors
Avic X930BT w/ backup camera

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As of 6/11/16 605,552 miles

2005 Excursion Eddie Bauer 4X4 6.0
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post #10 of 24 Old 11-19-2012, 05:54 AM
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Also, dealer said the injectors tested fine. Truck does not smoke outside of a hard acceleration or really cold starts. Dealer also reflashed the PCM with latest flash. Can I have a bad injector/s and not know it? No CEL, no codes, no smoke, passed buzz test. What can cause this vibration at 3rd and 4th at 1400-1800 rpm? It does it as soon as it shifts into 3rd or 4th, goes away once rpm's get up.

2002 F250 CCSB Lariet 7.3 Auto
2" helper springs 285/75R16 Toyo M/T
80 gallon fuel tank in bed
DIY 6637
Warn Premium Hubs
Ford Transmission @ 407,425 miles 3/24/12
Full Force Injectors
Avic X930BT w/ backup camera

www.riverchasefarms.com
"We Farm for Ducks"

As of 6/11/16 605,552 miles

2005 Excursion Eddie Bauer 4X4 6.0
Stock 225k miles
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