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1999 Grand Marquis randomly stopped starting


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jackkep
New User

Jan 12, 2017, 9:05 AM

Post #1 of 9 (821 views)
1999 Grand Marquis randomly stopped starting Sign In

A little over a week ago I pulled into my driveway and turned off my car. Later that evening I went to get groceries and the car just wouldn't start.

My car: 1999 Mercury Grand Marquis
160,000 miles
Oil level fine
No issues while it was running
I haven't made any changes other than adding a new radio a couple weeks ago.
Worked fine before, the occasional hesitation starting, maybe once a week it would take a 4 or 5 seconds to catch and start, but it would always start on the first key turn.

What I know/What I have tried:

-Checked fuses

-Replaced the fuel filter

-I can hear the fuel pump turn on, I do not have a pressure gauge to test the pressure at my engine but if I press a pin into the port where I would put a pressure tester fuel sprays everywhere.

-The spark plugs do have power and they do work (we pulled them out and my friend held them and grounded himself while I cranked the car and he always got a big shock. Very scientific)

-If I spray engine starter into my engine it will start and run on the starter for a second then cut out.

-I checked power to the fuel injectors and they have power, but when I measure the ground to the injector and try to crank the power does not pulsate like it should.

-I called a local mechanic and he said to check the grounds for injector pins in the PCM, I opened the PCM and put my multimeter on ohms/continuity and put the positive lead on the battery and the negative lead to the PCM injector pins, it did not zero out. If I touched that negative pin to ground on the cars body the reading would zero out. I tried cranking the car while checking the reading on those pins and it fluctuated mildly but still did not pulsate like it should.

-He told me to check the grounding wires for the PCM but I have no idea where those are or how to do that. (My friend's 2001 Ford Escape has a grounding wire leading from his PCM wire bundle but mine does not and never did.

-The mechanic also told me to check my camshaft sensor, I checked that there was power to it and there is, but that's the extent of what I knew how to do.


What are my next steps


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 12, 2017, 9:29 AM

Post #2 of 9 (807 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

Unless radio job really messed this up which happens all points to a lack of fuel delivery. Codes can help if you can get them post the #s even if no light was noticed.


Other: IDK why by chance so many of this era just up and failed the relay for the fuel pump but you said you hear it. Takes two seconds to swap that with the A/C relay if exactly the same part # and should be if it cranks right up it didn't empower fuel pump enough. More often it's all or nothing for that.


Worth a try then a noid light and fuel pressure test would be in order if it started with starting fluid for a short while,


T



Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 12, 2017, 12:20 PM

Post #3 of 9 (792 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

Is the theft light blinking while your attempting to start the engine?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


jackkep
New User

Jan 12, 2017, 3:51 PM

Post #4 of 9 (771 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

Yes it is. Rapidly


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Jan 12, 2017, 4:02 PM

Post #5 of 9 (767 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

That means the immobilizer is active, so the PCM is disabling the injectors. Do you have another PATS key? The key has to have the PATS transponder built in. I've seen people use non PATs keys and the engine won't start.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


jackkep
New User

Jan 13, 2017, 9:00 AM

Post #6 of 9 (739 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

So the transponder ship actually fell out of my key...... I don't have an extra one...... Great now I'm at the mercy of my local Ford dealer. :/


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 13, 2017, 9:01 AM

Post #7 of 9 (737 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

A good locksmith can also create and program a key for you.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



jackkep
New User

Jan 13, 2017, 9:12 AM

Post #8 of 9 (731 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

I thought only dealers could help me because a locksmith CANNOT create a new transponder set for me, they can only copy it from a key I already have.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 13, 2017, 9:15 AM

Post #9 of 9 (728 views)
Re: 1999 Grand Marquis randomly stopped starting Sign In

Says who?

Different makes have different requirements but locksmiths can handle most all of them. Many independent repair shops can also.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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