North American Turbocoupe Organization



Fuel Pump Relay
Dan E Offline
Posting Freak
#1
I have had a noticable "clicking" in the Right Rear while driving (cornering and when stopping).

At first I thought it was the RR PRC actuator until I realized I had the Ride Control on Firm.

Then I thought I had not gotten the RR Shock tightened at the top. Checked that out OK.

Yesterday, I got home and turned it off. Then I turn it to KOEO to activate the Fuel Pump and relays, etc. It made that same "clicking" that I had been hearing.

Then it occured to me that it was the Fuel Pump relays. After the Fuel Pump charges up I can hear the relays go "click, click"...."click, click".

These (two) relays are mounted in the trunk on the pass side metal drop down panel.

My question is why would these relays be clicking during driving ? The Fuel Pump relays should only activate to energize the Fuel Pump when starting...right ? Then why would they be activating anytime after the engine was running ?

Could this be part of my Fuel Pump problem ??? Like an interruption of voltage to my fuel pump ? I checked the appearance of all the FP wires and connections and everything looked OK (no fried or bare wires).
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
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JT Offline
Posting Freak
#2
im back...anyway....

Quote:Originally posted by Dan E:

These (two) relays are mounted in the trunk on the pass side metal drop down panel.

Those two relays are the Hard and Soft actuators for the Programmed Ride Control, in the trunk behind the passenger side on the metal tray.

Your fuel pump relay is located in the black box next to the passenger front strut tower under the hood.

That black box also contains the EEC relay, and the primary and secondary fan relay, A/C clutch solenoid control.

JT

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JT
[email protected] www.geocities.com/turbocpe/
1987 T-Bird Turbo Coupe T-5
1994 T-Bird LX 4.6L
1988 T-Bird Turbo Coupe A4LD
1988 T-Bird 3.8L
1979 T-Bird Heritage 351M

[This message has been edited by JT (edited 06-24-2001).]
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turbocoupeterry Offline
Member
#3
hey jt i think dan is right im not trying tostart a fight here but my fuel pump relays are on the back panel as weel in my 88 tc. just my .02
88 tc, new tires and a k&n filter fender mounted
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JT Offline
Posting Freak
#4
Quote:Originally posted by turbocoupeterry:
hey jt i think dan is right im not trying tostart a fight here but my fuel pump relays are on the back panel as weel in my 88 tc. just my .02

Hey,

According to the Helm Ford shop manual, no they are not.

i can scan and post the pictures if anyone doubts.

JT
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JT Offline
Posting Freak
#5
Here is the proof from the Ford shop manual....Click on the pictures

JT

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JT
[email protected]
www.geocities.com/turbocpe/
1987 T-Bird Turbo Coupe T-5
1994 T-Bird LX 4.6L
1988 T-Bird Turbo Coupe A4LD
1988 T-Bird 3.8L
1979 T-Bird Heritage 351M
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Dan E Offline
Posting Freak
#6
Well, I guess I was wrong... But why would my hard and soft PRC relays click like that when I have it set to the Firm Position ?

Man, I could have sworn those were the Fuel Pump Relays ? My bad...
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
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TurboCoupe50 Offline
Posting Freak
#7
JT is correct, I had to mount AC,EEC & FP( now in trunk) relays when I transplanted the 5.0 in my TC. All these relays (as well as fan relays) are in the controll module mounted near the intercooler.

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Three 1988 Turbo Coupes ..... yea one of em has a 5.0

[This message has been edited by TurboCoupe50 (edited 06-24-2001).]
1988 Turbo Coupe331 AOD

1972 Comet GT

1969 Fairlane Cobra 428CJ 4-Speed
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Jeff K Online
Administrator
#8
Yup, JT is 100% correct. The 2 relays on the rear drop down panel, pass side, are the hard and soft shock relays. The ABS and PRC computers are there also. On 87-88, the FP relay is in the integrated controller module on the front of the pass side strut tower. The fan relays, A/C clutch relay, and EEC power relay are also in the module, along with a voltage inverter or 2. I believe the FP relay is in the trunk, above the pass side wheel well on 83-86 TCs. At least that is where the FP relay is on my 86 Tbird 5.0.

Dan, as far as your 3500-4000 RPM problems, I agree with most who say fuel. It could be the pump is weak, or just not enough pump for your power levels, but I can see another possibility.... IF the FP is correct under load (39 psi + boost press), and there is still the miss / hesitation problem it could just be the EEC programming. The way I see it, at WOT, as RPMs climb, so does air flow. At some point, the VAF maxes out (door fully open), and then the EEC goes to a preprogrammed injector pulse width vs RPM mode. THis programming is based on stock motor specs, not 18 psi with ported heads, K&N, 3" exhaust, etc. Since air flow will be greater than the EEC thinks it should be, the motor would run lean. On my TC, I dont have any miss, etc at 3500-4500 RPM at WOT (I have a new 255 lph pump), but I do notice that power seems to be much better if I back off to 7/8 throttle or so. This has got to have something to do with the EEC programming! Strange thing is my A/F gauge always reads dead rich at WOT under any conditions, but I take that with a grain of salt, as the narrow band O2 sensors in our cars max out just a little above / below the 14.7 ideal low load A/F ratio (lambda = 1). A adj FPR might help, or it might not. I know that I got a seat of the pants improvement in my speed density Tbird 5.0 with the AFPR set to a LOWER than stock pressure because the EEC programming is set way rich at WOT which kills power somewhat.

Oh, ya, as for the clicking relays, run the PRC self test and see if you get any codes.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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TCx2 Offline
Senior Member
#9
Jeff,

How does one do the self test for the PRC?

Also is there anyone that does EEC programming for these cars? I ask this from a 4cyl stand point and also if my "dream" ever comes to pass, and I committ heresy and put a V8 in the TC. I was drooling over the Ford SVO Racing catalog the other day but would like to have an EEC that would compliment (not argue ) with my modifications. I had a 94 Mustang GT and the computer did not care very much for the E303 Cam that was in the car. Car ran hard.. but at idle there was a constant battle going on.




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Kevin
TCx2
88 White TC, 5spd, Loaded
88 Black TC, 5spd, Base
87 LtBlue TC, 5spd,Loaded
Kevin
TCx2
67 Green Ford Fairlane 428CJ 5spd
89 Fiji Blue Chrysler Conquest
03 Mercury Marauder "Supercharged"
03 Ford Excursion(King of the SUVs)
04 Mustang Cobra - Screaming Yellow
10 Challenger R/T "Supercharged"
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JT Offline
Posting Freak
#10
Quote:Originally posted by TCx2:
Jeff,

How does one do the self test for the PRC?


im not Jeff, but i can answer the question, i think. There is a connector below the ash tray in the center console. You need to jump those two terminals in that connector to put the PRC in the self-test mode.

Below is the steps:

1) Make sure headlights/parking lights are OFF

2) Set the Firm/Auto switch to the AUTO mode

3) Jump those two terminals in the connector as i mentioned above

4) Start the engine

5) Within 20 seconds after engine start, remove the tool that you used to jump those 2 terminals

6) Count the blinks of the FIRM light

When you have done so, let us know the results. There is quite a bit to the PRC system to troubleshoot it.

Quote:Originally posted by TCx2:
Also is there anyone that does EEC programming for these cars?

Well that guy that i know and have talked about on this board here, who was a Ford Engineer who now works for Roush that is also working on the MAF conversion, well he probably will be making chips for these engines if he has the time. He has an interest in them, i believe. But he's been busy with the newer Ford chips.

He does this in his spare time. He has built custom chips for the newer Fords. And he has had quite a bit of satisfied customers.

Or, you might try the EEC tuner. That might be a good thing, if you know what you're doing. And its not really that easy at first.

JT



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JT
[email protected]
www.geocities.com/turbocpe/
1987 T-Bird Turbo Coupe T-5
1994 T-Bird LX 4.6L
1988 T-Bird Turbo Coupe A4LD
1988 T-Bird 3.8L
1979 T-Bird Heritage 351M
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