2001 Mercury 175 EFI hard start hot. 0T265122

[2000TritonTR21]

0T265122 I have seen other posts with same concerns but no fixes? I hope this isn't the nature of the beast! But I have changed out spark plugs. Replaced fuel supply hose from tank to pulse pump with bulb. Replaced fuel filter and water sensor. Performed Compression test and it passed, fuel pressure test is at 42 psi. Found posts that talk about keeping motor level when restarting motor. Like others have said to only way to get this boat started is to give it some throttle. Then you have to coax it back to neutral without it dieing out. Thanks for any help.

[JOE54]

sounds like sensors/switches need set up or tested for ranges and timming linkages adjusted out to start with , also check for fuel leakage in inj housing/flooding intake

[2000TritonTR21]

Thank you, I did see that there is a Link and Sync procedure. Is this what you are talking about. Special tools needed to perform this procedure. Sorry! Ford Senior Master tech side coming out. Thanks again.

[JOE54]

sensors can be tested with ohm meter as well as TPS adj , need timming light possible dial indcator ,and a FACTORY serv manuel for that engine ser number , change brands of fuel see if it helps also

[2000TritonTR21]

I did purchase the shop manual on line. But you said you could adjust the TP sensor with a OHM meter. I will check on that. I know there are test in the shop manual for each sensor. I just figured you would set that by voltage? Thanks for you help.

[JOE54]

volt /ohm meter

[2000TritonTR21]

Ok after checking sensors with volt/ohm meter. Throttle position sensor was off. Setting was at 1.40 volts. Set to 2.51. Seems to start and idle better. My question is how do you test the Ignition Control module. There is no test procedure in shop manual. Thanks for the help.

[JOE54]

elimination process of other parts

[2000TritonTR21]

Anyone know where I can get one. That won’t break the bank. What about this CDI company good stuff?

[Nikon Man]

Anyone know where I can get one. That won’t break the bank. What about this CDI company good stuff?

Are you looking for, a TPS ????

On your TPS adjustment I noticed you said: (Setting was at 1.40 volts. Set to 2.51), hopefully you met to say .251 vdc.

[JOE54]

think hes looking for controller

[2000TritonTR21]

yes sir, .251 is what we set it at. Sorry. No ideas on where to purchase a 857169T2? or CDI 144-7169?

[2000TritonTR21]

Why would when engine is running and pulling spark plug wires off you can tell starboard side cylinders hit harder then port? We switched coils from port to starboard and no difference in fire? Could this be and issue with Ignition controller module? Maybe trigger, stator or ECU? Thanks for your help.

[EuropeanAM]

Can't really get anything accurate on a cylinder "drop" test AT IDLE. Engine needs to be under load, with some RPM's (at least 1500 RPM's) in order to accurately ascertain whether or not the cylinder is really contributing to the total power output.

[2000TritonTR21]

We did have it throttle up. With muffs on. Port side was firing but not as strong as starboard side. We also checked spark with the ignition spark tool where you adjust the board out. Spark is great. Checked injector flow and it pass. Compression good. Doesn’t it have to be fire? Thanks for the help

[2000TritonTR21]

Also checked pulse fuel pump for leaking fuel. Checked good. #6 cylinder seem to be the worst on cylinder differential. Reeds looked good with borescope. Thanks

[JOE54]

i had a cdm 200 one time eat my lunch do this same stuff almost trigger was bad , had good spark on all 6 too

[2000TritonTR21]

My friend that owns a marine repair shop has helped me. He said it comes down to just replacing parts now. If I put a trigger on would it not be wise to replace the stator at the same time? I know it's just money but I would like a dependable boat. What is a cdm 200? Thanks everyone.

[JOE54]

cdm ignition equipped 200 , no would not replace stator yet

[EuropeanAM]

+1 on not replacing stator- it's unlikely the ignition side of the stator is bad if the engine runs or has spark on multiple cylinders.

One way to catch the trigger: Perform continuity tests on the Trigger as the manual instructs, with the trigger disconnected. During each test, move the throttle from idle-to-WOT-and back SEVERAL times while watching for any sudden changes in readings.

This particular trigger tends to deteriorate in the harness itself (first)... often see a crumbling harness sheath.