Flat_Black13z New Reader
Aug. 18, 2010 5:55 p.m.

So we've got a 99 Crown Victoria P71. Its going in the local demolition derby. But we have a auto trans problem.

When you start it up and stick it into drive (or any forward gear) the transmission acts like its a direct drive, with no torque converter, it just lugs terribly and tries to cruise away like its stuck in gear with a manual transmission. Typically it stalls. Not good for a demo derby. Reverse is fine. Hot or cold doesnt matter. We dont know the previous history on the car, other than they have to run and drive from the police auction. It seemed fine then, but it also had most of its entrails then too. Im not entirely sure if the car had the problem when it was complete, as i didnt have it then.

Any ideas? Is there a lockup solenoid that i can unplug? Also, any ideas for a theme? Thanks.

patgizz SuperDork
Aug. 18, 2010 8:25 p.m.

lockup solenoid sounds stuck. but might need a factory trans wiring diagram as you'd need to attempt to snip the correct wire or risk losing trans operation altogether.

black/white theme, doesnt get any easier

RossD Dork
Aug. 19, 2010 7:22 a.m.

or blues brothers.

Flat_Black13z New Reader
Aug. 19, 2010 6:01 p.m.

TTT keep the ideas coming please. I'll start look looking for a diagram unless someone else has a great idea and chimes in.

I was hoping that it was as easy as unplugging the lockup solenoid on a 3t40.

patgizz SuperDork
Aug. 19, 2010 11:01 p.m.

nah the plug on the 4r70w is like the plug on a 4l60e. unplug it and trans doesnt work cause stupid solenoids control everything instead of the tried and true valves of old

curtis73 HalfDork
Aug. 20, 2010 10:37 p.m.

Find someone with a Genisys scanner, or hook up a volt meter to the TCC solenoid wire. That way you can monitor if the computer is locking the solenoid, or if the solenoid is stuck.

if its the computer, snip the wire to the TCC solenoid. If its the solenoid, yank it out and stuff the hole with a bolt and some JBweld.

Since you mention that it only happens in forward, you can almost definitely rule out the TC itself

You'll need to log in to post.

Also on Grassroots Motorsports

Making a Solid Rear Axle Perform

1 day ago in Project Cars

Solid axles get a bad rap.

2017 Acura ILX

1 day ago in New Car Reviews

Acura's ILX is a direct competitor with it's cousin, the Honda Civic. The Acura badge typically signifies a slightly more ...

Deal of the Month: GRM Sticker Kits for Just $19.95

1 day ago in News

Fresh stickers for a fresh season.

On All Fours

2 days ago in Articles

Audi’s Sport Quattro was a winning rally weapon in the ’80s and remains a shockingly powerful highway cruiser today.

Reader's Ride of the Week: Enviate Hypercar

3 days ago in News

There’s fast and there’s FAST–and then there’s this thing.

Join the Grassroots Motorsports Dyno Day

6 days ago in News

Join us for a dyno day in Sterling, Virginia.

From the GRM Vault: The Art of Understatement

1 week ago in Articles

The Harvey brothers dominated autocross in an obsolete Datsun a couple decades ago.

2017 Volkswagen Golf TSI SE

1 week ago in New Car Reviews

The quintessential European hatchback continues to pour out of Volkswagen's plants. Our test car featured four doors, a turbocharged 4-cylinder ...

We're Giving Away a $500 Race Ramps Certificate

1 week ago in News

Joining the drawing is totally free.

25 Project Path

1 week ago in Articles

A walk through 25 of our favorite project cars from the past.

Our Turbo Miata Goes Boom

1 week ago in Project Cars

Engine swap and suspension revamp before our race in two weeks? Challenge accepted.

The Ultimate Weekend Getaway for Your Car Club

1 week ago in News

Save a corral space just for your club at the Mitty.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

Also get your instant access to the digital edition of Grassroots Motorsports Magazine!

Learn More
q0GGbesZIXUJqPJRUfu9VJKR0Q4IaMtT