95 Missing/No Power at High RPMs

D

ddrinnen

New Member

Sep 8, 2011

4

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0

Sep 16, 2011

#1

• Sep 16, 2011

• #1

My Car 95 GT Convertible
Mostly Stock as far as i know.
Equal length shorty headers
BBK TB
BBK Cold Air Intake
19# Injectors
New Fuel Filter
Used MSD Coil
New Cap & Rotor
New Ford Racing Wires
New Spark Plugs - Bosch Platinum, which I have read was a bad choice
Cleaned MAF


Problem:
Car drives great normal everyday driving. Once RPMs get up to around 3700 missing/no power starts. Max RPM is about 4500 before engine is to bad that I dont try to go any higher. I checked my fuel pressure 30psi at idle 42 psi at rev up but 29 psi at constant throttle 3000 rpms before change fuel filter. changed fuel filter and missing still occured. I just want to see if my next step is to change fuel pump or if this is an ignition issue or the engine is just done. 200k plus miles.

Any advice is greatly appreciated.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Sep 16, 2011

#2

• Sep 16, 2011

• #2

A 4K RPM cutout (or slightly funky idle) sometimes coincides with using plats. Some copper Motorcraft plugs might be a good idea.

Are you sure the used coil is good?

 

wheelyman19

Active Member

Mar 31, 2008

155

1

29

Sep 16, 2011

#3

• Sep 16, 2011

• #3

Clean the maf once. My car sounded the same as yours till I cleaned it.

 

wheelyman19

Active Member

Mar 31, 2008

155

1

29

Sep 16, 2011

#4

• Sep 16, 2011

• #4

Clean the maf once. My car sounded the same as yours till I cleaned it.

 

toyman

10 Year Member

Jul 19, 2007

1,944

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79

Vernon BC

Sep 16, 2011

#5

• Sep 16, 2011

• #5

For about $16 I'd replace the coil. Copper core plugs usually work better.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Sep 16, 2011

#6

• Sep 16, 2011

• #6

Richard, where do you get a quality coil for 16 beans? (I want one).

 

toyman

10 Year Member

Jul 19, 2007

1,944

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79

Vernon BC

Sep 17, 2011

#7

• Sep 17, 2011

• #7

Who said a quality coil? My bad, $26 for a Duralast. Comes with a 2 yr warranty though. Quality (or perceived quality) comes at a higher price.

 

D

ddrinnen

New Member

Sep 8, 2011

4

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0

Oct 2, 2011

#8

• Oct 2, 2011

• #8

OK I changed the sprk plugs; no help. I have also found that it is a torque issue. If I slowly raise RPMs I cna get to 5500 no problem. Could the timing chain be stretching under high torque? And if so how can I test it before replaceing?

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

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Oct 2, 2011

#9

• Oct 2, 2011

• #9

What have you done in terms of diagnostics?

 

D

ddrinnen

New Member

Sep 8, 2011

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0

Oct 2, 2011

#10

• Oct 2, 2011

• #10

Just what I have mentioned

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Oct 2, 2011

#11

• Oct 2, 2011

• #11

You've briefly checked fuel pressure and replaced plugs, right?

You have not swapped out ignition components from a friend's car yet?

Have you checked ignition timing itself? Is the SPOUT connector in place?

 

D

ddrinnen

New Member

Sep 8, 2011

4

0

0

Oct 3, 2011

#12

• Oct 3, 2011

• #12

Have not replaced coil or checked timing. I will do both.

 

green95stng

New Member

Oct 3, 2011

6

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2

Indiana

Oct 4, 2011

#13

• Oct 4, 2011

• #13

I was having a similar problem with my car. My fuel pump was putting out good pressure but low volume. Replaced the pump and no problems anymore.

 

L

lloydstrange

New Member

Feb 17, 2011

8

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1

San Diego CA

Oct 12, 2011

#14

• Oct 12, 2011

• #14

Had the same exact problem with my 95 gt automatic. Turned out to be the coil. I replaced it in the parkinglot

 

L

lloydstrange

New Member

Feb 17, 2011

8

0

1

San Diego CA

Oct 12, 2011

#15

• Oct 12, 2011

• #15

Drove it immediately ran purrfect