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

Mark Your Calendars: August 18 Is Wear Your Helmet to Work Day

15 hours ago in News

Wear your racing gear to work and win prizes.

Your Projects: Homemade Lancer Evo

16 hours ago in News

Can't import a Mitsubishi Lancer Evo III? This forum member just built his own replacement.

Rapid Transit BMW: Meet an Early 5-Series With a V8 Swap

21 hours ago in Articles

Killing a Butterfly With a Sledgehammer

You Need This: SEMA Show CRZ

21 hours ago in News

If green paint and big speakers are your thing, you've come to the right place.

Deal of the Month: Christmas in July!

22 hours ago in News

Get a year of our magazine for just $10.

Tech Tips: 2006–’15 Mazda MX-5

1 day ago in Articles

We asked a couple experts for the best way to upgrade the NC MX-5.

Project Turbo Miata: Hitting the Dyno With a Fresh Engine

1 day ago in Project Cars

After getting a new engine, our turbo Miata project rolled onto the dyno.

Reader's Ride of the Week: Proud Prius

1 day ago in News

Paul Sexton takes the checker while staying green.

Your Projects: Throwback MR2

1 day ago in News

Take a Toyota MR2 AW11, add mud flaps and a cool livery, and you're ready for rallycross.

You Need This: Wacky Mazda RX-8

1 day ago in News

Out with the rotary and in with the luxurious Infiniti drivetrain.

From the GRM Vault: Subaru Bounces Back

4 days ago in Articles

Proof that motorsports involvement can lead to corporate success.

Your Projects: SkinnyG's V8 Pontiac Firefly

4 days ago in News

Talk about a sleeper.

OUR SPONSORS

Grassroots Motorsports Magazine

Subscribe Today

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

Learn More
sex7ffhU1rJfeRPXdnAQdDkmuwCYJwqd