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Replaced plugs and wires...gas mileage worse

 
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Old 02 Feb 2014, 07:05 am
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Default Replaced plugs and wires...gas mileage worse

I have a 2002 PT Cruiser on which I recently replaced plugs and wires. It was at 60000 miles when I purchased it and I noticed it was sluggish to start and figured it may still be running on original plugs and wires. After reading the sticky on plug/wire replacement, I purchased a set of BWD wires and Champion 7570 double platinum plugs. When I pulled the old plugs, I noted they were clean but definitely worn. After replacing, it started more easily and ran more smoothly but my gas mileage dropped from 22.9 miles/gallon to 19. I have run two tanks of fuel with the same result.

Has this happened to anyone before and any ideas of what to check?

Thanks!

Eric
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Old 02 Feb 2014, 08:16 am
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Default Re: Replaced plugs and wires...gas mileage worse

Eric,

Have you had this PT since new or is it second hand? Just asking because you don't know what has been done if your not the original owner. If you are the second owner, the best thing to do is change all fluids (tranny and oil), plugs and wires (like you did), PCV valve and some good throttle body cleaning.

Why you dropped in gas mileage is a mystery but as others have said, you need to keep really good records over a length of time and always fill up the same way to get a good record of how the mileage is doing.
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Old 02 Feb 2014, 09:27 am
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Default Re: Replaced plugs and wires...gas mileage worse

You cannot base fuel mileage on 2 tanks. Topping off the tank has too much leeway. Only after 5 or so tanks will you get an accurate reading.
I record all my filllups, and see a wide variation tank-to-tank, even when following the same route to work.
Go over 1,000 miles and then compute mileage.

Also, now that the car is running better, it could easily be that you are enjoying giving it the gas....

Make sure your tires are fully inflated and a new air filter couldn't hurt.
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Last edited by quicksilverdon; 02 Feb 2014 at 09:30 am.
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Old 02 Feb 2014, 11:33 am
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Default Re: Replaced plugs and wires...gas mileage worse

If all possible other mechanical problems are ruled out could it be the extra power gave your right foot (left if UK PT) some extra push?
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Old 02 Feb 2014, 12:23 pm
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Default Re: Replaced plugs and wires...gas mileage worse

I would ensure you got the correct size plugs. 2000 and older had shorter one- It happens frequently.

It's also possible something got disconnected during the install or plug wires aren't quite on all the way.
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Old 02 Feb 2014, 01:54 pm
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Lightbulb Re: Replaced plugs and wires...gas mileage worse

What are the plugs gapped at?(most reccommend gap @ .040),and for a 2.4L N/A PT Cruiser the NGK V-Power #LRTR4A-11 spark plugs might have been a better choice.......But,be sure to check the gap,and don't use one of the 'coin/disc/key-chain style' gappers either(not accurate enough).
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Old 02 Feb 2014, 02:55 pm
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Default Re: Replaced plugs and wires...gas mileage worse

Quote:
Originally Posted by UptownSport View Post
I would ensure you got the correct size plugs. 2000 and older had shorter one- It happens frequently.
Whut?
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Old 02 Feb 2014, 04:39 pm
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Default Re: Replaced plugs and wires...gas mileage worse

Quote:
Originally Posted by NitroPT View Post
If all possible other mechanical problems are ruled out could it be the extra power gave your right foot (left if UK PT) some extra push?
We still use the right foot as the "go button" over here in dear old Blighty.
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Old 02 Feb 2014, 04:57 pm
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Default Re: Replaced plugs and wires...gas mileage worse

Quote:
Originally Posted by cdynaco View Post
Whut?
Charliehorse,

Uptown explained that to me in a private message because I too didn't understand it.

His reply:

What's happened is people are getting 2000 and older 2.4 (Stratus/Cirrus) plugs for some reason.
I'm shocked at how many engines I've disassembled and found this! The engine functions, but the Stratus plugs are recessed in the head.
Because it happens so often, I wonder if some plug company has incorrect information, or what.

...and a link to go with it: Shorty Spark Plugs
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Old 02 Feb 2014, 05:04 pm
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Default Re: Replaced plugs and wires...gas mileage worse

Quote:
Originally Posted by CREWZIN View Post
Charliehorse,

Uptown explained that to me in a private message because I too didn't understand it.

His reply:

What's happened is people are getting 2000 and older 2.4 (Stratus/Cirrus) plugs for some reason.
I'm shocked at how many engines I've disassembled and found this! The engine functions, but the Stratus plugs are recessed in the head.
Because it happens so often, I wonder if some plug company has incorrect information, or what.

...and a link to go with it: Shorty Spark Plugs
Got it. I thought maybe he meant 2002 and older PT's (01) but mis typed.
You would hope parts houses would not just look up "Chrysler 2.4L" but also specific to the PT application.

Thanx!
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