2002 Mercury Marquis engine problem

FUQUA51

MEMBER
2002 MERCURY MARQUIS
112,000 MILES

I have a 2002 mercury grand marquis and it shudder around 30 to 50 mph I was asked have I unhook the egr valve and I did but no luck and even replace it with a new one. I replace the fuel filter and it stop for like a day and I thought it had something to do with the fuel, but a few days ago the engine light clicked on. So I took it to three different places to get them to read code and all came back saying it was transmission shift control solenoid so I had that replace like two days ago and no luck. To me it seem worst now I can drive down road it shudder and then right after, it stalls and temperature light pops on and goes right out so if there is anyone out there have any idea I need help

8 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Try cleaning the MAF sensor and check TPS closed and WOT voltages

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Sunday, October 6th, 2013 AT 12:44 AM

FUQUA51

MEMBER
7 POSTS

I just got threw cleaning the MAF sensor and I went ahead and change out the TPS and it was no luck, at first I thought it was fix but after the car warm up it shudder and stalls for a minute and cut off so it will spin over but won't crank at first and in about ten seconds it cranks right up and I turn it back off to see will it fire back up and it did every time after that it only cut off while riding and you can press the gas sometimes and its like its busting up until you turn it off an back on.

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Sunday, October 6th, 2013 AT 10:49 AM

MADMIKE1735

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951 POSTS

Have you checked fuel pressure yet? Its possible your fuel pump is on its way out, and is giving you these issues. Lets start with the basics before you waste anymore money on parts you dont need.

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Sunday, October 6th, 2013 AT 3:10 PM

FUQUA51

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OK could u go by telling me how to check the fuel pressure or is it best to take it to a shop

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Monday, October 7th, 2013 AT 9:52 AM

MADMIKE1735

MECHANIC
951 POSTS

At this point, you should bring it to a shop. Your check engine light is on, there are codes for your transmission shift solenoid, it would be worth it to have a reliable diag this to be certain what it needs. You replaced your tranny solenoid once, and the code came right back. Either the new part is bad, or more likely a wiring issue.

To check fuel pressure, you will need to rent a fuel pressure test gauge, any parts store usually will rent them for a small fee. Also, you will need the smaller "ford" end to screw onto your fuel test port located on your fuel pressure rail.

Again, it would be easier to have a reliable shop go through this vehicle so we can be certain what the problem is.