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Unread 04-12-2010   #1 (permalink)
dardenus is offline Apprentice

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Default 2003 Mustang mach 1 rev issue

Hey,
Long story short, I had the gas pump in my pony replaced not long ago (they said they put in a Bosch) but she didnt run right at all. I went ahead and put in Motorcraft spark plugs and now she idles better than ever, and if i rev the motor up at a fairly regular speed, no problems at all, however if i punch it real quick, she all but dies.

heres the only ideas that I have:
1) pump cant send enough gas fast enough, not sure what model number the pump is, going back to the shop tomorrow to ask.

2) plug gap is wrong. I think it should be close, but I had a fairly cheap gap tool and could have gotten it a bit off

3) plugs are not torqued properly. I have not had my torque wrench calibrated in a while, so it may be off by a few pounds. its one of the old style ones, not the click type.

4) IAC is dirty? seems to be the solution everybody jumps to when ponys dont run quite right.


Would love some input on where i need to be looking!
Thanks guys.
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Unread 04-13-2010   #2 (permalink)
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You obviously have Dumb idiots working on your car,there always seems to be issues that SHOULDN'T be happening? the 4V's require little to make them run properly for a Long Time, don't understand all your dilemas, sorry about your bad luck??
Bosch pump? They don't make one for an intank for this application. Your need to datalog your fuel rail pressure under WOT!
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Unread 04-13-2010   #3 (permalink)
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Honestly, i have never had an issue with this car until this spring, took it to NTB for a coolant change, and have had nothing but hell since. not sure what you mean by bosch doesnt make an intake pump... its a fuel pump, however it made me uneasy when i went to their website and didnt see a fuel pump for my car listed, made me wonder wtf they put in, or if its just an older model not on the website any more.
Ill try going to the local car part shops and see if anybody will let me rent a fuel pressure gauge, should screw right on to the rail where i usually press the button to release pressure right? looks like the stem on a bicycle tire.

side note that i just thought of, my pony did throw an error msg saying "fuel rail pressure sensor circuit failure". I decided to clear the code and see if it would throw the code again to verify that yes theres really an issue, or if there was just moisture in the sensor causing it to fail or something along those lines. it has not thrown the error again, but clearing it may have been a dumb move on my part. It threw the error after having the gas pump installed, before I changed spark plugs.
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Unread 04-13-2010   #4 (permalink)
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If the fuel pressure checks out, check your throttle position sensor (I'm sure there's a how-to out there about proper voltages on it... google).
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Unread 04-14-2010   #5 (permalink)
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This is the exact reason why I do all the work on my GT on my own because I am not like some of the idiot mechanics out there that just want to make money and quickly get your car in and out of their shop.

Rushing on engine work = problems...
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Unread 04-14-2010   #6 (permalink)
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yes yes, i have learned my lesson. I should be able to rent a fuel pressure tester, open the throttle all the way, and see what it reads, right?
Not sure if theres any way to test the gas pump itself, could have been a bad one i guess.
Throttle position sensor is a good idea! Wouldnt exactly explain why itl go all the way to redline if reved somewhat slowly. maybe fuel filter? im running out of ideas rather quickly.
i kinda wonder if a bad fuel raid pressure sensor could cause issues like this though.

thanks for the tips
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Unread 04-14-2010   #7 (permalink)
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Your FRP sensor is bad, gonna have to replace it, and DON'T put ANY TYPE of cleaning solution ANYWHERE near it again.
Have you properly burped your cooling system like I specified to fix your overheating problem? And for others reading this don't go to someplace advertising "powerflushing of the cooling system"
Don't do that! Proper maintainance is all that needs to be done, change it out every couple years and add a bottle of Redline water wetter! And you wanna change your fuel filter every 15K miles, I need to do mine!
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Unread 04-14-2010   #8 (permalink)
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yeah i got all the air out so shes not having any heat issues now, though i did find a micro mini pin hole leak from the thermostat housing to the bottom of the radiator so im gonna need to replace that hose and re burp it all over again, but now that i know what im doing its no biggie, worked like a charm

On a side note, is this a motorcraft only part? or if not, is it one of those things that i really should stick with non 3rd party on? any rough idea what i should be expecting to pay for one? looked fairly easy to replace.

Kinda wondering if i should be replacing my o2 sensors also, my uncle mentioned that i should have changed them by now and that bad readings from them could be confusing my computer.
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Unread 04-14-2010   #9 (permalink)
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Sounds like it could be the FRPS but usually your car will run like crap even during normal driving. i think a new one is 80-100 bucks from Ford. I think i have a spare at the house that worked when i took it off.
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Unread 04-14-2010   #10 (permalink)
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Quote:
Originally Posted by 2oo5GT View Post
Sounds like it could be the FRPS but usually your car will run like crap even during normal driving..
Depends on what exactly you mean by this. I took her for a spin around the appt complex i live in a few days ago after replacing spark plugs and she was running a million times better with new plugs, but still not right. Coming from a stop she was a bit jerky, the best way I can describe it is like riding with somebody thats new to driving a manual. I think it all adds up to being the FRPS, so im going to check my ford shop manual and google on diagnostic tricks before i go spend 100 and cross my fingers lol, but im fairly sure itl test out as being bad, makes more since than anything else I have thought of.

Thanks guys,
After testing and most likely replacement ill report back. After this, a few radiator hoses, and new tires hopefully ill be done replacing stuff for the season lol. no fun buying parts that are not performance
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Unread 04-14-2010   #11 (permalink)
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You said your getting that Fail rail sensor code and it keeps coming back when your clear the codes, should be an indication that there's a problem with it..
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Unread 04-14-2010   #12 (permalink)
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I got the error code but what made me think maybe its not the problem is that after clearing the code, it did not come back. bit confusing imo that it would throw a code, but wouldnt throw it again
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Unread 04-16-2010   #13 (permalink)
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Let us know what you find out or if it is the FRPS.
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Unread 04-22-2010   #14 (permalink)
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i got my new FRPS, pulled out the dip stick to put a bead of oil around the rubber gasket, put everything back togeather, and shes runnin like a champ!
all she needs now is to replace the coolant hose that has a tiny leak and she should be good!
tyvm for everybody that helped me this spring, shes never given me trouble until recently, but hopefully shes happy for quite a while now.

Thanks again guys
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Unread 09-07-2010   #15 (permalink)
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Quote:
Originally Posted by dardenus View Post
Hey,
Long story short, I had the gas pump in my pony replaced not long ago (they said they put in a Bosch) but she didnt run right at all. I went ahead and put in Motorcraft spark plugs and now she idles better than ever, and if i rev the motor up at a fairly regular speed, no problems at all, however if i punch it real quick, she all but dies.

heres the only ideas that I have:
1) pump cant send enough gas fast enough, not sure what model number the pump is, going back to the shop tomorrow to ask.

2) plug gap is wrong. I think it should be close, but I had a fairly cheap gap tool and could have gotten it a bit off

3) plugs are not torqued properly. I have not had my torque wrench calibrated in a while, so it may be off by a few pounds. its one of the old style ones, not the click type.

4) IAC is dirty? seems to be the solution everybody jumps to when ponys dont run quite right.


Would love some input on where i need to be looking!
Thanks guys.
Hey how are you, I just joined the forum, I was reading about your 03 mach 1. I have the same exact car, same year same color, and oddly enough the same exact problem you were describing. The car bogs when it is at full throttle or heavy acceleration. I have been chasing the problem down trying to fix it for over 3 years with no luck, I had just about given up. Then by searching for fuel injectors on google I happened to find your post and it just so happens its the same problem. You said that you replaced the fuel pressure sensor, since then have you had any other problems with it bogging? I sure would like to fix my car finally.
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