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93 Ford Probe GT - Shaking (Tried usual remedies)

Tiny
93PROBE
  • MEMBER
  • 1993 FORD PROBE
Hello,

I have a 1993 Ford Probe GT, 2.5L, V6 Manual Transmission. I have recently begun to notice a harsh shaking when the car is idling and accelerating. It appears to happen more in 1st, 2nd, and 3rd gear at low rpms and high rpms. It seems smoother when rpms are in midrange (2,000 to 2,750). I have been searching your forum and trying the remedies suggested. Therefore, I have replaced the following items:
- Spark Plugs
- Spark Plug Wires
- Air Filter
- Engine Mount.

None of these solutions have fixed the shaking. Any suggestions would be greatly appreciated!
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Sunday, January 7th, 2007 AT 10:52 PM

6 Replies

Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
A clarifying question: I'm not clear as to whether you seemed to indicate whether or not the shaking was coming from the engine or some drive train component. So will the car shake while sitting still and revving the engine, or does it only shake while driving? If it doesn't shake while the car is sitting, then it's not coming from the engine. Let us know.
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Monday, January 8th, 2007 AT 5:50 PM
Tiny
93PROBE
  • MEMBER
  • 4 POSTS
That is a good question, I should have specified that. The car does shake while it is sitting and the engine is being revved. It doesn't appear to be as severe under these conditions but still very apparent. Let me know if you need to know anymore information. Thank you in advance for your response!
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Monday, January 8th, 2007 AT 6:39 PM
Tiny
INDYUKE
  • MECHANIC
  • 416 POSTS
Here's several ideas.

You might have low or no compression on one cylinder.
A completely plugged fuel injector.
Spark might not actually be reaching a spark plug.

If your check engine light is on, that might indicate that the knock sensor has detected a misfire.

Good job on thinking engine mounts. They wear out too, thus allowing the engine to do a lot of shaking and flopping around.
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Tuesday, January 9th, 2007 AT 7:28 PM
Tiny
93PROBE
  • MEMBER
  • 4 POSTS
I never thought of the low or no compression to one cylinder. I did want to run a suggestion by you that another person had suggested.

Would a bad ignition coil be the cause of the shaking?

Would scanning the engine pick up the problems you mentioned if the "check engine" light was on? The problem is that about 4 years ago I had Ford run the engine scan and fix all problem codes. After this was completed, the "check engine" light was still on. So they told me it could be a faulty light indicator, which I am starting to believe is not true :)

One thing I think I forgot to mention also was that a couple of times I have smelt a gas smell while driving. I don't know if this impacts your decision.
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Tuesday, January 9th, 2007 AT 10:01 PM
Tiny
93PROBE
  • MEMBER
  • 4 POSTS
Or maybe a bad 02 Sensor? Or bad Mass Air Flow?
Thanks!
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Tuesday, January 9th, 2007 AT 10:43 PM
Tiny
AUSTIN78989
  • MEMBER
  • 17 POSTS
Make sure your spark plug firing order is correct

(near firewall) 1 3 5
ENGINE BLOCK
(near bumper) 2 4 6

into the corresponding numbers 1-6 labeled on the distributor

(I have a 97 ford probe gt and this is the order I use) The workshop manuals, and most sources get the firing order incorrect on the V6 probe KLDE motors.

Some things that can cause shaking are too much fuel in one cylinder (stuck open injector), too little fuel in one or more cylinders (stuck closed injector), a vacuum leak, I have actually noticed my map sensor acting up and causing similar symptoms as you have stated, so you can try unplugging that and see if the problem still persists, also check to be sure your engine isn't in open loop, or partial open loop.

If you have access to any live data scanners I've noticed that when the ecu on my 97 pgt is over richening one bank of cylinders, and leaving the second bank lean the resulting effect could be a very shaky engine.

I am just throwing stuff out there, I am no expert, but I have been working on my car quite a bit, and been through similar situations.
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Friday, October 20th, 2017 AT 10:16 PM

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