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Need major help. 4.2 98 auto

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Old 07-30-2015, 09:43 PM   #1
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Default Need major help. 4.2 98 auto

Having a problem that i can't solve. At beginning my truck used to shake only in park. Then slowly started shaking in drive only in lower rpms. Now seems like it shake all the time in drive. Less when just at a light but more in lower rpms. Have replaced plugs, wires, coils, and engine mounts. Cleaned iacv and maf. Took it to a mechanic he couldn't figure it out also. He said there was no misfires while accelerating but was misfires when decelerating. No check engine light. Another thing. When accelerating I can hear like a little jingle noise and when I put my foot down at higher rpms it sounds like bbs in a tin can. Thanks. Any help would be great.
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Old 07-31-2015, 10:49 PM   #2
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Anyone?
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Old 08-01-2015, 07:35 AM   #3
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Have you tried a fuel system cleaner or any thing like that you might want to try sea foaming your engine cheap enough were if it does fix your problem no real harm
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Old 08-01-2015, 08:24 AM   #4
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Sea foamed it twice. Weird thing is second time I did it it smoked way more.
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Old 08-01-2015, 10:52 AM   #5
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Going back to when it would shake only in park. What did it do when in neutral? Did it still shake? What's it do in neutral now?

Do don't mention the year of the truck but have you looked up the service bulletins from Ford?
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Old 08-01-2015, 12:23 PM   #6
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It shook in neutral also. My truck doesn't show the rpms but I think it pretty much shakes in lower rpms. Since when I put in drive the rpms go up right? No I havent.
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Old 08-01-2015, 04:39 PM   #7
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Intake manifold runner control issues.
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Old 08-02-2015, 05:39 PM   #8
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Quote:
Originally Posted by Carcrazygts2 View Post
Intake manifold runner control issues.
Wouldn't that throw a code?
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Old 08-02-2015, 08:10 PM   #9
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Originally Posted by bleed_blue11 View Post
Have you tried a fuel system cleaner or any thing like that you might want to try sea foaming your engine cheap enough were if it does fix your problem no real harm
Wow. I'm sorry but he clearly has an issue that a little mystery oil isn't going to be able to solve.
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Old 08-02-2015, 08:12 PM   #10
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Quote:
Originally Posted by Phillup View Post
Having a problem that i can't solve. At beginning my truck used to shake only in park. Then slowly started shaking in drive only in lower rpms. Now seems like it shake all the time in drive. Less when just at a light but more in lower rpms. Have replaced plugs, wires, coils, and engine mounts. Cleaned iacv and maf. Took it to a mechanic he couldn't figure it out also. He said there was no misfires while accelerating but was misfires when decelerating. No check engine light. Another thing. When accelerating I can hear like a little jingle noise and when I put my foot down at higher rpms it sounds like bbs in a tin can. Thanks. Any help would be great.
Find a new mechanic. If he can't figure it out, he is not good at what he does. I'm not a mechanic but if I have a vehicle with those symptoms I would be able to figure out the issue.
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Old 08-02-2015, 08:12 PM
 
 
 
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