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93EXCivic
93EXCivic MegaDork
4/17/13 5:20 p.m.

So the F150 is running kids funny. When it is at idle at a stoplight, it shakes quite a bit and when I am cruising at a constant speed it has a hesitation. I am guessing it is a fuel problem since the cap, rotar, spark plugs and plug wires where replaced fairly recently (it was owned by a fellow board member so I am fairly confident this was done) so my guess is a fuel problem. Any ideas of where to start?

HappyAndy
HappyAndy SuperDork
4/17/13 5:42 p.m.

Running funny you say?

You could help us out with a year and engine.

nicksta43
nicksta43 Dork
4/17/13 6:11 p.m.

F

O

R

D

93EXCivic
93EXCivic MegaDork
4/17/13 6:14 p.m.

Yeah that would probably help. 1995 with a 5.8, I guess the best way to describe it is it feels like someone is lightly kicking the back of the seat...

Ranger50
Ranger50 PowerDork
4/17/13 6:19 p.m.

Soft misses are fuel. Obxious and hard misses are spark.

On something that old, fuel filter and all-rpm fuel psi test. If those check out, injectors and related wiring.

Does it do this when warm and/or cold?

93EXCivic
93EXCivic MegaDork
4/17/13 6:33 p.m.

Warm and cold

egnorant
egnorant Dork
4/17/13 6:37 p.m.

Any codes or check engine light?

Without more info we could run through every multi-initialed sensor in the book only to discover that it needed a bottle of injector cleaner.

Bruce

Kenny_McCormic
Kenny_McCormic Dork
4/17/13 6:40 p.m.

Changing a fuel filter will never hurt. You know it was a problem if mud pours out the dirty side.

aussiesmg
aussiesmg UltimaDork
4/17/13 6:41 p.m.

Check the plug wires and plugs

Recently swapped parts are the first to check on

93EXCivic
93EXCivic MegaDork
4/17/13 6:57 p.m.
egnorant wrote: Any codes or check engine light? Without more info we could run through every multi-initialed sensor in the book only to discover that it needed a bottle of injector cleaner. Bruce

No codes. Already ran injector cleaner thru it.

93EXCivic
93EXCivic MegaDork
4/17/13 7:00 p.m.
Kenny_McCormic wrote: Changing a fuel filter will never hurt. You know it was a problem if mud pours out the dirty side.

Yeah I am going to do that first. Probably needs it anyway.

Streetwiseguy
Streetwiseguy UltraDork
4/17/13 7:00 p.m.

Funny- ha ha, or funny damn strange?

peter
peter HalfDork
4/17/13 8:33 p.m.

Too much nitrous?

The_Jed
The_Jed Dork
4/17/13 8:45 p.m.

N Sperlo
N Sperlo UltimaDork
4/17/13 8:54 p.m.

Last time I had a rough idle and run regardless of temperature, it was the QuickTrip fuel I put in. It happened twice. I don't get fuel there anymore.

This was in a 5.0 F150.

JtspellS
JtspellS Dork
4/17/13 9:03 p.m.

What plugs are in it?

I've had MANY that had anything other than OEM plugs in causing many misfire issues.

N Sperlo
N Sperlo UltimaDork
4/17/13 9:21 p.m.

I use Motorcraft plugs in all my Fords.

curtis73
curtis73 GRM+ Memberand UltraDork
4/17/13 9:28 p.m.

First, clean the valve body. They get gummed up and vacuum passages (as well as the IAC passage) get obscured.

Check the timing chain for play. That is a common issue.

Then check the EGR valve. It can get sticky and respond disproportionately to vacuum.

Then check the MAP sensor. Find someone with a Genysis or similar scanner and you can monitor what numbers its supplying while these "kicks" are happening.

wearymicrobe
wearymicrobe Dork
4/17/13 9:41 p.m.

IF it is a modern ford then yeah its a EGR valve. But that old I would have to say spark.

turboswede
turboswede GRM+ Memberand PowerDork
4/17/13 10:37 p.m.

Stop buying your oil at the gas station that shares a lot with the comedy club.

Did you try getting drunk and heckling it?

turboswede
turboswede GRM+ Memberand PowerDork
4/17/13 10:37 p.m.

Stop buying your oil at the gas station that shares a lot with the comedy club.

Did you try getting drunk and heckling it?

93EXCivic
93EXCivic MegaDork
4/21/13 5:43 p.m.

So I change the fuel filter, changed the transmission fluid and cleaned the throttle body. I also checked the spark plugs and wires. They are good. The truck runs much better now but it still idles like crap.

Also the radiator is leaking. I can't catch a break. The radiator in my Civic is done, the fiance just had to have the A/C compressor and alternator belt replaced and now the radiator in the F150...

93EXCivic
93EXCivic MegaDork
4/21/13 5:57 p.m.

Also the fluid was reddish brown. What is the chance my transmission will not be long for this world?

nicksta43
nicksta43 Dork
4/21/13 7:27 p.m.

Reddish brown would be normal. Brownish black would be bad.

93EXCivic
93EXCivic MegaDork
4/21/13 8:40 p.m.
nicksta43 wrote: Reddish brown would be normal. Brownish black would be bad.

Sweet. This is the first automatic I have ever owned so I had no idea.

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