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Author Topic:   Gas mile-age woes
kid vishus
Gearhead

Posts: 6220
From: middle of NC
Registered: Oct 2000

posted 03-16-2005 07:33 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
My fuel mile-age of my Lightning has plummeted. It runs fine, although it does seem down on power a little. I always chalked that off to it having 200k miles and KK's truck having 96k so it feels much stronger (probably because it is.) My truck doesnt miss, it doesnt do anything to indicate it has any fuel issues. The one thing that I have wondered about is the factory cat's are still on it. Could one of them be plugged up and killing my gas mile-age?

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Fastymz
Moderator

Posts: 19581
From: Reno Nv USA MEM#1240
Registered: Apr 2001

posted 03-16-2005 08:09 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
Those are the same symptoms my dads 88gt was having. Changed the cats and all was good again.

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oddly obsessed with big scoops on little Mustangs

65 coupe 351w C4 Big Boss 429 hood scoop,8" 3.40 TracLoc.

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MLariviere
Moderator

Posts: 4008
From: Biddeford,Me.USA
Registered: May 99

posted 03-16-2005 09:21 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Is there a way you could test them,like reading the exhaust gases with an anylizer?

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BlueMule
Gearhead

Posts: 1494
From: Kent Island, MD USA
Registered: Sep 2002

posted 03-17-2005 07:49 AM     Click Here to See the Profile for BlueMule   Click Here to Email BlueMule     Edit/Delete Message   Reply w/Quote
Would the analyzer pinpoint a nasty injector or two?

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-Paul

70 Mach1 351C/FMX
79 Ranchero GT 302 smogger/C4
97 Expedition XLT 5.4
00 SVT f150 Lightning 4149 of 4966 Born on: 06/26/2000

'If you're not the lead dog, the view never changes.'

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kid vishus
Gearhead

Posts: 6220
From: middle of NC
Registered: Oct 2000

posted 03-17-2005 08:16 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I don't know about an analyzer.

I do know I have had a rattling sound coming from one of the cats for some time now. It sounds like it has several large rocks rattling around inside it.

Also, what about a bad O2 sensor? Would that cause fuel mile-age to go bad?

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SteveLaRiviere
Administrator

Posts: 43790
From: Saco, Maine
Registered: May 99

posted 03-21-2005 07:01 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
A classic symptom of plugged convertors is a low vacuum reading. Why don't you compare it with kk's Lightning and see how they stack up?

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'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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kid vishus
Gearhead

Posts: 6220
From: middle of NC
Registered: Oct 2000

posted 03-21-2005 09:33 PM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
I've been told a bad O2 would also cause my mile-age to go to pot. However, I'm having difficulty finding an OE sensor for it.

I'll have to check vacuum readings. I don't know if the convertors on KK's truck are plugged or not, they aren't on it anymore.

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Thud
Gearhead

Posts: 1296
From: Cumming,Ga.,USofA
Registered: Jun 99

posted 03-22-2005 06:54 AM     Click Here to See the Profile for Thud     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by kid vishus:
... I'm having difficulty finding an OE sensor for it.

I put a Bosch O2 sensor from the local parts store on mine. It's identical in every way to the one I pulled off except it has no Ford oval stamped into the metal. The original was obviously made by Bosch.

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"I only drink to steady my nerves. Sometimes I'm so steady I don't move for months." - W.C. Fields -

"I don't care where I sit, as long as I get fed." - Calvin Trillin -

Dwayne

M&M Member #18
Son of Smurf
'94 Lightning #942 of 4007
'67 Mustang Coupe
'70 Mach1
'75 Cougar
'65 Galaxie 500 + parts car

[This message has been edited by Thud (edited 03-22-2005).]

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kid vishus
Gearhead

Posts: 6220
From: middle of NC
Registered: Oct 2000

posted 03-22-2005 07:11 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
Thanks. They had a universal O2 for it (brand unknown), but the parts guy wouldn't swear it would just plug in to the factory harness.

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lawless
Gearhead

Posts: 444
From: Richmond, VA
Registered: Aug 2000

posted 03-30-2005 11:37 AM     Click Here to See the Profile for lawless   Click Here to Email lawless     Edit/Delete Message   Reply w/Quote
Hey Rob,

If I remember correctly, the universals will fit, but they are made with two different pigtail lengths. If the replacement has the correct wire length to reach the harness connector it should work.

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