Diagnose

Tiny
LEMELROSE
  • MEMBER
  • 2004 FORD FREESTAR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 171,000 MILES
My minivan shakes when its accelerating, especially uphill, what could cause this?
Friday, December 24th, 2010 AT 6:10 PM

10 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Could be motor mounts or inboard CV joints. Shake more in steering wheel or seat?
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Friday, December 24th, 2010 AT 7:07 PM
Tiny
LEMELROSE
  • MEMBER
  • 6 POSTS
No, it shakes when I accelerate. I had the engine code pulled, and they think its my ignition. The spark plugs and wires are less than a year old, and I just recently cleaned my EGR and replaced the gasket to it.
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Friday, December 24th, 2010 AT 7:50 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
What was code in P0xxx format? So you have an engine miss?
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Friday, December 24th, 2010 AT 7:53 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Try this. Put car I gear while holding brake firmly. Give it a little gas peadal like you were going to start out but remain stopped. Does it shake?
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+1
Friday, December 24th, 2010 AT 10:42 PM
Tiny
LEMELROSE
  • MEMBER
  • 6 POSTS
I've done that, and it will hesitate. The only time it really gives me trouble is when I'm going up hill. It hesitates a little at other times, but it really stands out then; at that point, sometimes the engine light will flash
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Friday, December 24th, 2010 AT 10:47 PM
Tiny
LEMELROSE
  • MEMBER
  • 6 POSTS
The PO format codes are as follows:

P0300,0301, 0302, 0303, 0304, 0305, 0316, and 0401
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Saturday, December 25th, 2010 AT 12:50 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Those codes are all MISfire codes and the last 1 is EGR. So EGR may be faulty and ignition module/coil(s) could be the culprit. Might want to do EGR first as it could cause misfires. You might try a block off gasket to test if vehicle then runs fine.
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Saturday, December 25th, 2010 AT 7:26 AM
Tiny
LEMELROSE
  • MEMBER
  • 6 POSTS
The EGR issue was addressed about 3 wks ago, I replaced the gasket and checked the hoses. I thought the spark plugs were loose, but I took it to my mechanic, he raised it up, checked them and said they weren't. I started the van this afternoon, took the hoses from the EGR, and nothing was loss; in fact, I took the van for a spin and it ran better than it has in weeks.I'm confused.
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Sunday, December 26th, 2010 AT 2:34 AM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
The EGR is designed to allow a properly proportioned addition of exhaust gases to be re-burnt by adding them to the intake mixture at certain speeds and loads. Any leakage at any other time will distort mixture too much and cause misfire which the computer may try to compensate for which may also cause problems. Any malfunction/leak from EGR usually has very noticeable effects on engine performance. By blocking off EGR completely you are able to tell if IT was contributing/causing any running performance issues.
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Sunday, December 26th, 2010 AT 8:49 PM
Tiny
LEMELROSE
  • MEMBER
  • 6 POSTS
Ok, I'll try that, ? Though. Which hose? I've got 2 small hoses on the top. And a shorter but bigger hose (it's about a 1/4 inch in thickness but about 5 inches long) - on the bottom.
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Sunday, December 26th, 2010 AT 8:55 PM

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