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Engine vibration at idle.

 
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  • 2 Post By ptcruisersteve
  • 2 Post By ptprice

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  #1 (permalink)  
Old 22 Jul 2019, 08:14 pm
Fresh Cruiser
 
Join Date: Nov 2017
Posts: 30
Default Engine vibration at idle.

Originally I post this question on "Tech & Performance" Forum
but got no response.
Hoping to get input here.

Engine vibration at idle started after P0401
code came on second time. First time code came and
disappear,then second time it came back after about 3 months.
Decided to change EGR valve with modulator.
Since I was already under the hood, replaced

spark plugs gapped at 0.42 "champions 443 copper",ignition coil,new wires,
throttle body cleaned new gasket installed,
pcv valve and hose, egr valve and modulator 2 new gaskets and rubber ring. all parts confirm oem.

After all installed, started engine and noticed that before
engine started immediately, now it takes two turns for engine
to start. Is it normal for engine to start on second
turn,rather then immediately?
Rpm steady.
No codes.

After 2 week and 100 miles, engine ignition will take sometimes
several turns to fire, sometimes 1,5 turns to fire.

Vibration still there almost at the same level.
What could be other causes of engine vibration?

I read forum posts on vibration causes,
engine mounts and timing belts seems to be
prevalent causes.
In my case timing belt was replaced, this was verified
by service shop.
Bought car used.


2002 PT LIMITED 93000 miles
Thank You.

Last edited by kurabess; 24 Jul 2019 at 11:20 pm.
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Old 22 Jul 2019, 11:44 pm
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Join Date: Aug 2014
Location: Thousand Oaks, CA
Posts: 7,309
Default Re: Engine vibration at idle.

I would suggest hooking up a vacuum gage and see what the results is. Report what you find.
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Old 24 Jul 2019, 11:18 pm
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Join Date: Nov 2017
Posts: 30
Default Re: Engine vibration at idle.

Thank You for reply.
Will report on Your suggestions.

Jack.
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Old 25 Jul 2019, 09:16 am
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Join Date: Nov 2012
Location: Ormond Beach, Fl. 32174
Posts: 2,163
Default Re: Engine vibration at idle.

SOOO BIG had a timing belt failure at around 80,000 miles.
Unfortunately it happened on the interstate just as I'd slowed from 80mph to pull off for gas. I was waiting at a light on the exit to a small south Georgia town when the timing belt failed at idle. Nothing but the belt was damaged. I was near a Wilco parking lot I managed to roll into, found the store manager hooked me up with truck mechanic who did the job right there on the asphalt. Later, I discover he'd not correctly installed the belt idler.

Over time the engine began vibrating. Just slightly at first. I cruised along for nearly 8,000 miles as it became a progressively intensifying engine vibration, developing finally into the belt idler bearing failing. That shrapnel trashed the belt, pump, all the innards and the cover. The whole shebang! As it was a massive tear down, I did a complete re'do including new external belts, a new radiator while it was out and four new mounts.

I'd figured because the timing belt had been replaced, I was secure in assuming the vibration couldn't possible be a timing belt problem. But the second time it failed big time! Of course the second repair was the charm. Done by a trusted local mechanic. SOOO BIG's good for another 100,000 miles now.

At least consider closely checking the work done on installing the timing belt and it's constituents as it apparently was done before you owned the PT.

Good Luck. Happy PTin', ptprice
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Last edited by ptprice; 25 Jul 2019 at 03:31 pm.
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Old 01 Aug 2019, 12:24 am
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Join Date: Nov 2017
Posts: 30
Default Re: Engine vibration at idle.

First time using scan tool
Bit of learning how/to.
As far as vibration, scan show
that MAP sensor way off.

Think MAP sensor maybe problem.
MAP sensor parameters according to
online info.,not working correctly.

Will double check once
We Obd2 book arrives.

Hopefully will be able to
resolve my engine vibration
and fuel consumption.

Thank You.

Jack.

Last edited by kurabess; 01 Aug 2019 at 12:18 pm.
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Old 01 Aug 2019, 12:45 am
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Join Date: Nov 2017
Posts: 30
Default Re: Engine vibration at idle.

Quote:
Originally Posted by ptprice View Post
SOOO BIG had a timing belt failure at around 80,000 miles.
Unfortunately it happened on the interstate just as I'd slowed from 80mph to pull off for gas. I was waiting at a light on the exit to a small south Georgia town when the timing belt failed at idle. Nothing but the belt was damaged. I was near a Wilco parking lot I managed to roll into, found the store manager hooked me up with truck mechanic who did the job right there on the asphalt. Later, I discover he'd not correctly installed the belt idler.

Over time the engine began vibrating. Just slightly at first. I cruised along for nearly 8,000 miles as it became a progressively intensifying engine vibration, developing finally into the belt idler bearing failing. That shrapnel trashed the belt, pump, all the innards and the cover. The whole shebang! As it was a massive tear down, I did a complete re'do including new external belts, a new radiator while it was out and four new mounts.

I'd figured because the timing belt had been replaced, I was secure in assuming the vibration couldn't possible be a timing belt problem. But the second time it failed big time! Of course the second repair was the charm. Done by a trusted local mechanic. SOOO BIG's good for another 100,000 miles now.

At least consider closely checking the work done on installing the timing belt and it's constituents as it apparently was done before you owned the PT.

Good Luck. Happy PTin', ptprice
Thank You for reply.
Problem goes both ways.
In my case service shop checked timing belt.
Was told "all good there", how they come to that conclusion
do not know, but was told above was done.

That was two years ago.

Jack.

Last edited by kurabess; 01 Aug 2019 at 12:20 pm.
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Old 04 Aug 2019, 01:06 am
Senior Cruiser
 
Join Date: Jan 2013
Posts: 1,266
Default Re: Engine vibration at idle.

The map sensor is one of the controls for the EGR valve.

Check the wiring harness over the driveshaft. Early PT harnesses sometime sag and wear thru the plastic insulation and cause intermittent problems.
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Old 07 Aug 2019, 10:15 pm
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Join Date: Nov 2017
Posts: 30
Red face Re: Engine vibration at idle.

Thank You for reply

Jack.

Last edited by kurabess; 08 Aug 2019 at 11:48 am.
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