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Discussion Starter · #1 ·
I have a 2005 Titan 125k with the 2* timing advance, 3" straight exhaust, high flow cats, modded airbox, k&n, and maybe some other stuff here or there I'm forgetting. I've been having issues with it being slow to start since around June of 2010. It ACTS like the battery is weak, but the connections are all good, and the battery is full charged. I even tried swapping another known good battery and it didn't help with it being slow to start. Some mornings the truck spins over great and fires within a few seconds, others it spins over slow and won't crank at all till the 3rd or 4th time trying to turn it over. Even with a brand new battery it does the same thing, spins over slow some times and fast others. I've even went as far as to replace all the battery connections. Everything is stock electrical with the exception of a 7" Alpine fold out monitor, it's wired for a system but no system is in it and the fuse is out. Starting about 3 weeks ago I went to leave to haul some stuff for a friend of mine and it acted like the battery was dead (clicking and all), checked the battery and it checked out 12v, waited a second and the truck spun over fine but wouldn't crank. Tried this 3 or 4 times spinning over as fast as ever, showing good voltage, but no start. Eventually it started and ran fine. Was probably 2 weeks before it did it again like that (although slow to start everytime I try to drive it), and this time it spun over fine and wouldn't start. Tried again, same thing. Tried again, and it finally started. This morning I was trying to go to work and it's doing it again, but now won't start at all? It spun over strong 3 or 4 times, and now it's draining the battery trying to start.

Cliff notes:
-Slow to start, even with a known good or new battery
-All new battery connections
-Stock electrical
-Sometimes it spins over fast, sometimes noticeably slower regardless of battery voltage
-Lately will spin over fine and not start, eventually 3 or 4 tries later it starts
-Now spins over fine and won't start at all

Any ideas on where to start? Before this I've never had an issue with starting, although I do think I have an electrical issue somewhere as once or twice I have started it, went to leave, and it hung in high gear when put into drive I can either cut it off, or use the manual shift and once I get it to downshift once it works excellent. Also sometimes my gauges are slow to work after it starts, but within 1/2 mile or so work fine.

Thanks guys!
 

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2006 Titan Crew Cab Big Tow Off-road, 315/70-17 BFG MT2, Rocky Road Sliders, Bully Dog GT tuner
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86 Posts
Have you replaced the ECM relay? Sounds very much like that.. If so stop trying to start it as you'll be drowning your Cats in raw fuel and end up replacing them. $4 part, easy to grab and replace, check the IPDM/ECM relay threads stickied.
 
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