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Engine Miss On deceleration

 
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  #1 (permalink)  
Old 27 Sep 2011, 07:33 pm
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Default Engine Miss On deceleration

Hey, guys. I've got a 2002 PT Touring with 120,000 miles on it. I've done the timing belt/water pump replacement, and changed the plugs/wires around 80,000 miles. I really haven't had any driveability issues until lately.

When driving down the freeway around 65 or 70, I've recently begun to notice a little bit of a what feels like a mis-fire when I let off the gas to adjust my speed. I don't notice anything like this on acceleration. I also noticed something this evening that kind of freaked me out.

While waiting in a drive-thru line idling, the engine seemed to stumble and want to almost shut down unless I gave it some gas. This has me kind of freaked because I'm working out of town this week (about 2-1/2 hrs away), and I really can't afford to have it take a dump on me this far away from home. I have't gotten any check engine lights, so I'm really kind of at a loss as to what's going on here. Any constructive and helpful suggestions would be sincerely appreciated.

Thanks,
Steve

Last edited by sscanlan; 27 Sep 2011 at 08:36 pm. Reason: typo
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Old 27 Sep 2011, 07:44 pm
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Default Re: Engine Miss On deceleration

It's been 40K so it won't hurt to go for new plugs and wires. Its' cheap and easy and can't hurt.
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Old 27 Sep 2011, 08:40 pm
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Default Re: Engine Miss On deceleration

Thanks for the input, Carey. What kind of plugs/wires would you recommend for just everyday driving and dependability? I'm recovering from having a heart attack 4 months ago, and I was unemployed with no insurance at the time, so needless to say, money is kind of tight for the foreseeable future.

Thanks,
Steve
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Old 27 Sep 2011, 09:02 pm
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Default Re: Engine Miss On deceleration

Steve.

Almost any plug wires other than the OEM's from Chrysler. Even an inexpensive set form Pep Boys, Auto Zone etc.

Plugs. To save money, just a copper set from Champion but also price the Double Platinum Champions #7570 if it fits into your budget. Gap anything you bu at .040in
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Old 28 Sep 2011, 01:50 pm
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Default Re: Engine Miss On deceleration

have you ever cleaned the throttle body? If it's been awhile try that out...

I like the NGK plugs, copper will work just fine, .040 gap works well too for any plug.
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Old 01 Oct 2011, 03:33 pm
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Default Re: Engine Miss On deceleration

Hey, guys. I put in a set of the Champion Double Platinum's today along with a decent set of plug wires. The step by step pictures posted here on the website were a real big help, as I don't have a shop manual for my PT. I set my laptop up on the front seat while I was working and referred to that.

I did the key dance before I started to tear into this, and it had no codes stored. It seems to be idling just fine right now. I'm gonna take it out for a run pretty soon to see how it feels while driving it. My old plugs were just worn down, but looked normal, color-wise.

Steve
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Old 01 Oct 2011, 03:51 pm
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Default Re: Engine Miss On deceleration

With a 2002 you had to deal with the EGR pipe. Hope you got it back in good and tight. Let us know if the miss went away.
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Old 01 Oct 2011, 03:57 pm
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Default Re: Engine Miss On deceleration

Hey, Carey.
Yes, I got the EGR pipe back in and tightened sufficiently. I wanted to ask you, is the rubber hose that goes from the PCV valve back to the intake just normal gas-line style hose? Or is it a molded hose, so it won't collapse because of the bend? I noticed when I was working on the car today that at the end of the hose where it fits onto the manifold, it appears to have some small cracks in it. I think the hose is long enough for me to just chop around 3/4 of an inch off at that end and re-connect to the manifold, but figured I'd ask you while I'm at it.

Thanks,
Steve
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Old 01 Oct 2011, 04:22 pm
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Default Re: Engine Miss On deceleration

Steve,

It's not molded but you don't want to make that bend out of the PCV valve too tight as to make a crease in the hose and stiffen the air flow.
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Old 01 Oct 2011, 05:26 pm
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Default Re: Engine Miss On deceleration

That's kind of what I was thinking, Carey. I'm going to look at it tomorrow. I think I can chop about 3/4" off of the end attached to the manifold without causing the hose to collapse at the bend.

On a different note, I took the car out for a ride, and it seems to be idling smoother, with more power. I'll take this as a good sign!
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