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Discussion Starter · #1 ·
Help, my titan has been dead for 3 months now and I can not afford to have it wrecker to the dealer.

Before it quit running the service engine soon light came on and off, stopped into a parts store and the said the code was emissions but that is all they could retrieve from the code.

Before it quit running on 2 occasions it was hard to start after a short stop into a store, then just quit running backing down the driveway one morning. The fuel sending unit had gone bad a year before and I had it replaced so I thought that it might be the problem again. Let it sit until I got home that night, put 5 gal of fuel in the tank even though the gauge said I had fuel, it finally started after several attempts, pulled it into the driveway, turned it on and off 6 times with no problem. The next morning it would not start, this is where the fun starts.

Checked fuel pressure and it has about 50# when trying to start and the needle on the fuel pressure gauge was jumping back and forth from 45 to 55#.

Changed Plugs and Boots, no change to condition.

Someone looked at it and said it was the Ignition Switch, $350 later and still the same situation.

When you try to start the truck for the first few times it spits and tries start but it will not fully take off and run.

On 2 occasions since I last drove it into the garage it has started!!!, on one instance it ran rough at first with a lot of white smoke coming out the tailpipe and this seemed to settle down the longer it ran, turned it on and off about 6 times, no problem. Later went back and it would not start.

I found on line a comment about an electrical connection from the engine to transmission that can corrode.

Help if you can?
 

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ok so this little spiel is about a f250 powerstroke, so i dont know if this has anything to do with a titan, we took off the front engine plate and replaced it because the seals were all corroded and coolant was leaking out, when the new one was put on the truck did the exact thing your truck did, took us two weeks of looking at it and looking at the old plate to figure out a plug/sensor of some sort had not been put in the new cover, therefore the truck was sensing a problem and pressure was not being built up, i forget if it was oil pressure or what, but once that plug was put in the new plate the problem was solved. SOO if you have taken apart your motor check to make sure you have put everything back in and have no extra parts.

but what do i know? im just a 19 year old kid. lol. just my opinion. hope it helps, good luck.
 

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Yeah, sounds like the ECM relay is bad in the IPDM. This is an extremely common problem, and it's easy to diagnose and fix. Like beason said, swap the ECM relay (2nd one away from the 45 degree corner in the IPDM) with the fog lamp relay (4th one), and if it starts right up, you need a new IPDM. The engine light was probably your cats getting loaded up with fuel due to sputtering and cranking without starting due to the bad relay. Hopefully they weren't damaged. Search the forum for more info on the IPDM if you need it...there are quite a few threads where people have had this issue. Good luck!
 
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Just happened to my truck and it was the IDPM ... same problem as the OP
 

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you can do just the relay, but there have been reports of them going out again. the only REAL fix is the new IPDM board. Ive been driving on my switched relay since june of last year.
 

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Discussion Starter · #16 ·
This was the problem! I changed the ECM & Fog Lamp relay and she started right up, so sweet to hear my truck run once again, its been dead in the garage since before Christmas. We bought this truck new and I have really enjoyed it and in todays economy with it being paid off its that much better.

Once again guys THANK YOU SO MUCH for all your help!
 

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The 2007 has different cams and the ECU is different to take advantage of the cams. You want 2005-2006 probably.
 
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