Author Topic: Amateur mechanics - Car problem  (Read 9541 times)

RoadKingLarry

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Re: Amateur mechanics - Car problem
« Reply #25 on: March 10, 2012, 10:37:16 PM »
Quote
I'm thinking it's a vacuum leak still.  Wish I could find it.

I wouldn't give up chasing a vacuum leak yet. I've used WD-40 to find a few sucking engine wounds.
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Jim147

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Re: Amateur mechanics - Car problem
« Reply #26 on: March 10, 2012, 11:18:15 PM »
The TFI isnormally a good or bad thing. The hall effects seem to have hot problems when they act up.

I have a low mile '91 460 EFI down here if you want to try to shoehorn it in.  >:D

I have the in-laws coming down to take us to lunch for Sherri's birthday tomorrow but I should be able to get free in the later afternoon. I have fuel PSI tester, compression tester, ect. I can bring up.

Does that motor use the plastic intake spacers between the heads and the intake? They can burn through and cause an internal vacuum leak.

For chasing vacuum leaks, I have used water several times. It's not as quick to show as starting fluid but you always have some around.

jim

Also, just found the last piece of the governor that went flying when the cam broke.  [ar15]

Maybe I shouldn't help with your car.  =|
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wmenorr67

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Re: Amateur mechanics - Car problem
« Reply #27 on: March 11, 2012, 01:28:03 AM »
That 460 should fit into that Crown Vic just nicely.  If not I have a 93 F-150 that it would fit in. >:D
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CypherNinja

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Re: Amateur mechanics - Car problem
« Reply #28 on: March 11, 2012, 06:36:06 PM »
I had a problem very similar to this with a 1992 Caddy Brougham.

Turned out to be a gummed up Idle Air Bypass in the TBI.

Sorry if that's already been tried, I mostly skimmed the thread.  ;)
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Nick1911

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Re: Amateur mechanics - Car problem
« Reply #29 on: March 12, 2012, 08:33:09 PM »
dropped exhaust system - no change
replaced fuel filter - no change

Neighbor Tom (who use to build 302 and 351's for racing) got it to run by spraying wd40 into the intake.  He assures me it's a fuel problem.

Nick1911

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Re: Amateur mechanics - Car problem
« Reply #30 on: March 13, 2012, 12:11:29 PM »
This weekend - pulling injectors, ecu and MAP sensor from the junkyard.  I'm at a loss at this point for what else to do.

wmenorr67

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Re: Amateur mechanics - Car problem
« Reply #31 on: March 13, 2012, 01:26:38 PM »
Nuke it from orbit.
There are five things, above all else, that make life worth living: a good relationship with God, a good woman, good health, good friends, and a good cigar.

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Nick1911

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Re: Amateur mechanics - Car problem
« Reply #32 on: March 13, 2012, 01:40:41 PM »
Nuke it from orbit.

Aww, but I like this car!

White Horseradish

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Re: Amateur mechanics - Car problem
« Reply #33 on: March 13, 2012, 04:06:46 PM »
This weekend - pulling injectors, ecu and MAP sensor from the junkyard.  I'm at a loss at this point for what else to do.
Have you tested the temp sensor? And if you have, are you sure it was the one for the ECU and not one for the dash?
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drewtam

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Re: Amateur mechanics - Car problem
« Reply #34 on: March 13, 2012, 06:25:13 PM »
I would tend to suspect a fuel pump before the injectors.
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charby

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Re: Amateur mechanics - Car problem
« Reply #35 on: March 13, 2012, 06:46:02 PM »
I would tend to suspect a fuel pump before the injectors.

could be a little of both, weak pump with dirty injectors

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drewtam

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Re: Amateur mechanics - Car problem
« Reply #36 on: March 13, 2012, 07:30:26 PM »
could be a little of both, weak pump with dirty injectors



Yeah, good point. Especially if the injectors are spraying the walls too much or dribbling out now and not getting good atomisation while cold. When the engine is hot, it may cause the wet port walls to evaporate and make the problem go away.
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brimic

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Re: Amateur mechanics - Car problem
« Reply #37 on: March 13, 2012, 09:37:55 PM »
[quotecould be a little of both, weak pump with dirty injectors][/quote]

My TB gets an engine misfire/injector code once or twice a year, clearing the code with the OBD scanner only means the code pops up again the next day. Neighbor, who is a mechanic advised me to buy a quart of GM Top Engine Cleaner (~35) and dump it into the gas tank. Code usually goes away 1/2 tank of gas later and comes back on 6-8 months later.
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Jim147

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Re: Amateur mechanics - Car problem
« Reply #38 on: March 13, 2012, 10:05:38 PM »
This weekend is pretty free for me. If you need something just ask. I think I owe you one or more.

jim
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And sometimes goes on and on and on.

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Nick1911

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Re: Amateur mechanics - Car problem
« Reply #39 on: March 15, 2012, 10:24:18 PM »
Got it!

Mass Air Pressure sensor.  (Note: not MAF sensor)

drewtam

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Re: Amateur mechanics - Car problem
« Reply #40 on: March 15, 2012, 10:28:54 PM »
Got it!

Mass Air Pressure sensor.  (Note: not MAF sensor)

Huh. Thanks for posting the answer/resolution. One more thing from which to learn.
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charby

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Re: Amateur mechanics - Car problem
« Reply #41 on: March 15, 2012, 10:43:19 PM »
Got it!

Mass Air Pressure sensor.  (Note: not MAF sensor)

Awesome!
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Harold Tuttle

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Re: Amateur mechanics - Car problem
« Reply #42 on: March 16, 2012, 08:35:59 AM »
The replacement of a 50 dollar part is brought to you today by 700 dollars of diagnosis.

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Jim147

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Re: Amateur mechanics - Car problem
« Reply #43 on: March 16, 2012, 10:18:37 AM »
Glad you got it taken care of.

Since you don't need it, I wounder if I can shove that 460 in the tractor.

jim
Sometimes we carry more weight then we owe.
And sometimes goes on and on and on.

BAH-WEEP-GRAAAGHNAH WHEEP NI-NI BONG

wmenorr67

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Re: Amateur mechanics - Car problem
« Reply #44 on: March 16, 2012, 10:36:01 AM »
Glad you got it taken care of.

Since you don't need it, I wounder if I can shove that 460 in the tractor.

jim

Stock?
There are five things, above all else, that make life worth living: a good relationship with God, a good woman, good health, good friends, and a good cigar.

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dogmush

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Re: Amateur mechanics - Car problem
« Reply #45 on: March 16, 2012, 06:35:00 PM »
Got it!

Mass Air Pressure sensor.  (Note: not MAF sensor)

Cool, glad you got it.  So it was a fuel problem.

For future reference, The MAP sensor on early FI systems is a Manifold Absolute Pressure sensor.  It was replaced by a MAF, or Mass Air Flow sensor.  MAP's are used in conjunction with an Inlet Air Temperature sensor and engine speed information to find the mass air flow rate by speed-density calculations.  Ford switched to a MAF in the early 90's (depending on year).

Brad Johnson

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Re: Amateur mechanics - Car problem
« Reply #46 on: March 17, 2012, 08:19:52 PM »
IIRC the 460s stayed with speed density injection til they were replaced by the 6.8L V10 in the late 90's.  Only the CA models got mass air.

Brad
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