Low power/bad mileage

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Jan 2, 2006 | 09:55 PM

yjman90

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Joined: Feb 2004

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From: Phoenix

Low power/bad mileage

well guy's here it goes,89 E250 4.9L I did a full tune up with plugs/wires/cap/rotor then did the walker down pipe to 3" pipe aftermarket cat into a flowmaster turned out infront of the rear tire.sounds great but I seen to have lost most of my power and I'm down to 9mpg from 18mpg.nothing seems to be draging tires are full and I just put in a new air filter.I want my van back as I drive all over for my job and 9mpg is killing me.

Jan 4, 2006 | 02:59 PM

rowanimal

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I think you may have opened up your exhaust a little too much.?

Jan 4, 2006 | 03:55 PM

quicklook2

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From: Lakewood, Ohio

did you time the engine and forget to plug spout back in?

Jan 4, 2006 | 04:16 PM

Schmids4.9l

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From: Bored town OH

Lack of power and gas mileage sounds like timing. 3" exhaust is way to big for a stock 300.

Jan 4, 2006 | 04:19 PM

rhetor

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From: redding U.S.A.

perhaps the hold down nut isn't tight and enough and you rotated the distributor a bit without noticing while doing the tuneup.

Check her timing!

Jan 4, 2006 | 04:42 PM

IB Tim

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From: 3rd Rock

Quote:

Originally Posted by rowanimal

I think you may have opened up your exhaust a little too much.?

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Jan 4, 2006 | 05:28 PM

Silver Streak

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From: Broken Arrow, OK

Did you check the cat and muffler for obstructions before installation? It is pretty common for packing junk to be in there plugging things up.

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Jan 4, 2006 | 10:44 PM

rhetor

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From: redding U.S.A.

Going to 3" may hurt your power a bit, but it won't kill it. If it really is a noticable decrease in power i would look for PROBLEMS and not exhaust diameter.