1991 Mercury Grand Marquis (needs repair)

Needs lots of work.

Category:

Autos & Vehicles

Tags:

• 1991
• Mercury
• Grand
• Marquis
• (needs
• repair)

[1coppler]

i have a question I have an 1991 Grand Marquis LS when I first start it..Its starts smoking from the back of the motor.Is there any ideas of what it could be..Its like oil smell smoke..It also back fires..Like popping..COuld that be from the crack i have by the converter and the Pipe I have H-Pipes.Thanks

[retrochad]

@1coppler I have had a lot of trouble with the valve cover gaskets leaking on Ford engines...they will leak oil onto the exhaust manifolds and cause the smoke and burning oil smell. I'm not sure exactly what is causing backfiring as I haven't observed it on a fuel injected engine. It definitely would be good to get any exhaust leaks fixed though.

[kjm1983]

The carbed 351W was police issue. VV up until 1986, then 4bbl Holley.

Civilian Crown Vics got carbed VV until '83, then CFI until '86 when the changeover to SEFI happened(which you're 2 newer Marq's have). However, that's parsing it too much as far as swaps go. Use the factory motor mounts and any 302/351 will go into any of those cars easily. FMX/C6 is a better choice for duribility in a heavy car, either have to have SBF bell pattern.Trucks are good source for all of this.

[retrochad]

I didn't know there was a 4V intake manifold for the 351w, I had heard there was one for 351 Cleveland. Also didn't know they were using Holleys from the factory...I had read about a Holley retrofit carb made to replace the VV's though.

Were the 351's on these using AOD too in 91?

Wonder if I would need to make up a drive line replacement somehow to accomodate a different type of transmission. I would just as soon have a standard but that might be tough logistically...

[pickupman1995]

I love those style Grand Marquises, I had an '89, hope you restore her :)

[Franceboyy1]

It's a beautiful car for a French , it's typicul Americain ! (excuse me if i m bad in english )

[RetroVintageItems27]

Sadly looks to be a parts car...

Retro

[stars1976]

@1coppler that back fire could mean the timing is off a little

[1coppler]

I had spoken with a family member and i got an answer for the backfire could u tell me what it could be for my steering to be making noise while turning

[1coppler]

@retrochad When yours smoked did it smoke once you started it? And did it smoke if u ram the engine up a little? With the backfiring I think its a cylinder problem cause it was this one time I didnt engrease the idle up real high but i did that to see if the popping will go away.Then i let it go back down to reg. idle and then i turned it off. I happen to look under car and my passenger side calvalier was glowing up. But there is a crack right there when the pipe starts from the calvalier.

[ashho56]

Heres what you should do, with the motor, replace the oil pump, and watever else the motor needs, but the tranny, get the car out to a drag strip or a highway, and hold the pedal to the floor and when it hits 85 MPH, it should jerk really hard, make horrible sounds, and shift into 3rd, and after this, ur trans should work fine

[Killerhackpas]

burn oil car.

[NickWilliam89]

Just use it as parts for ur '90 Grand Marquis.

[NickWilliam89]

You should buy a Cutlass Ciera like I do. It gets great gas mileage.