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Rear gear - engine stops

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jarek_rugby

Rear gear - engine stops

Hi there
Today 2 times my engine stops.
It was on the parking area. I drive in, put rear gear and engine stops.
I started engine again, put rear gear and and after few meters engine stops again.
Any ideas what it is?

Chicks dig us 'cause we play RUGBY
F 150 1986 302 ci EFI
Pontiac Firebird 400 ci 1973

Gary Lewis

Re: Rear gear - engine stops

Administrator

Jarek - You may have the idle set too low, which can cause it to die. If you don't know, there's an idle speed screw on the right of the carburetor and down close to the intake and you can turn it clockwise slightly to raise the idle speed.

Otherwise, I can't think of any reason that it would die just in reverse.

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

jarek_rugby

Re: Rear gear - engine stops

Gary,
i have EFI engine .

Chicks dig us 'cause we play RUGBY
F 150 1986 302 ci EFI
Pontiac Firebird 400 ci 1973

Gary Lewis

Re: Rear gear - engine stops

Administrator

Oops! My bad.

Then I'm at a loss. Does your idle speed seem low? Does the truck die when you first put it in reverse or when you touch the throttle?

Gary, AKA "Gary fellow": Profile

jarek_rugby

Re: Rear gear - engine stops

it was when i touch the throttle

Chicks dig us 'cause we play RUGBY
F 150 1986 302 ci EFI
Pontiac Firebird 400 ci 1973

Gary Lewis

Re: Rear gear - engine stops

Administrator

Then it probably has nothing to do with Reverse. Instead the throttle position sensor may have a glitch in it.

You can test the TPS to see if it gives the values shown here: http://www.garysgaragemahal.com/diagnostics.html

And the idle speed adjustment is supposed to be here, but I'm on a hospital's wifi and it is S L O O O O W and doesn't fill in, so I'm not sure it is there: http://www.garysgaragemahal.com/efi-idle-speed-adjustment.html

Gary, AKA "Gary fellow": Profile

jarek_rugby

Re: Rear gear - engine stops

How could i do this without tachometer ? (idle speed)

Chicks dig us 'cause we play RUGBY
F 150 1986 302 ci EFI
Pontiac Firebird 400 ci 1973

Gary Lewis

Re: Rear gear - engine stops

Administrator

By ear. Get it where you like it and where it doesn't stall when going in gear, nor makes serious clunks.

But, if it is the throttle position sensor changing the idle speed won't help.

Gary, AKA "Gary fellow": Profile

Steve83

Re: Rear gear - engine stops

Banned User

In reply to this post by jarek_rugby

Any inexpensive aftermarket tachometer can be temporarily wired in under the hood just for diagnosis. It only takes 3 or 4 wires, and 2 of them (power & signal) connect to the truck's coil wires; the 3rd (ground) can be connected to the coil mount. If the tach has a 4th (to select the number of cylinders), it usually just splices into the ground wire.

jarek_rugby

Re: Rear gear - engine stops

Next question. How could i test - diagnose TPS?

Chicks dig us 'cause we play RUGBY
F 150 1986 302 ci EFI
Pontiac Firebird 400 ci 1973

Gary Lewis

Re: Rear gear - engine stops

Administrator

You use a digital voltmeter and check the voltage as shown in pic below, which is from the the link above. I believe that Vref is the orange/white wire, Signal Voltage will be the dark green/light green wire, and Ground is the black/white wire.

You will have to guestimate the angle, but if I'm right the TPS is going "open", meaning not providing an output or signal voltage just off idle. So I wouldn't worry about making sure that the signal voltage is spot-on at all the angles. Instead I would concentrate on what happens as you open the throttle. Does the voltage increase smoothly or does it go to zero and then come back at some point?