Bad MPG
Elder User
Joined: Sep 2002
Posts: 519
Likes: 0
From: Iowa
Being a 90, it would be EFI. A full tuneup, making sure your sensors are all working and not having a slipping tranny will all help your mileage, but at the end of the day, you're still driving what amounts to a large brick. Also, I don't know exactly why it is, but something about the EFI systems on these trucks just makes them use more fuel than they should. I can get better mileage with a well-tuned carb than most of these trucks do with EFI. Anyway, from my experience and what I've read on here, basically any EFI V8 Ford truck will get about 13 mpg, give or take 1 or 2.
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New User
Joined: Oct 2005
Posts: 9
Likes: 0
Thanks all
The truck has a new Jasper crate motor. It is EFI and Automatic tranny. I've installed new sensors [egr, map, tps, & IAC etc.]. It has headers and dual exhaust but the O2 sensor has not been installed. I'm going to drill a hole in the header and weld on the bung.
The truck has a new Jasper crate motor. It is EFI and Automatic tranny. I've installed new sensors [egr, map, tps, & IAC etc.]. It has headers and dual exhaust but the O2 sensor has not been installed. I'm going to drill a hole in the header and weld on the bung.
Cargo Master
Joined: Jun 2002
Posts: 2,033
Likes: 32
From: Aurora,Colorado
Originally Posted by vnmous
Thanks all
The truck has a new Jasper crate motor. It is EFI and Automatic tranny. I've installed new sensors [egr, map, tps, & IAC etc.]. It has headers and dual exhaust but the O2 sensor has not been installed. I'm going to drill a hole in the header and weld on the bung.
The truck has a new Jasper crate motor. It is EFI and Automatic tranny. I've installed new sensors [egr, map, tps, & IAC etc.]. It has headers and dual exhaust but the O2 sensor has not been installed. I'm going to drill a hole in the header and weld on the bung.
Dont you have a "check engine" light on in the instrument panel??
Place the O2 bung at the same distance from the heads as on the stock vehicle and preferably--on an crossover pipe --so that both banks gets measured.
Last edited by phoneman91; Mar 14, 2006 at 11:17 AM.
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Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
does that dual exhaust have a cross over pipe at all. if not have one put in and thats were you should install the o2 sensor.
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Freshman User
Joined: Aug 2005
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the slipping tranny doesnt help any but is not the main problem, new engine will suck more gas until fully broken in, hook scanner up-check inputs & outputs (engine coolant temperature E.C.T.) if pcm thinks engine is cold it will feed more fuel the o2 sensor is also an input that wouldnt hurt to have either (you need it) the temp sending unit for the guage on your dash is different than the ECT sensor DONT BUY AFTERMARKET
