Hi Newbie with BAD ecoboost issues with cam sensors!

[cobra351w]

Hi,

New to the forum, but been working and building cars for nearly ...50 years, for fun I must add, I work in IT ..jeez I'm old

I have dealt with many issues in the past , built my own AC cobra , installed and setup my own bespoke fuel injection and ignition systems , on both that and my track day mx5 NB (miata to you guys over the pond) .

But this has me stumped!

I purchased the car as part of a deal to get my mates ex back on the road, she bought my miata NC, she gave me the fiesta with a wet belt failure, something I regret now !

I pulled the engine, and stripped it, bottom end was good , but the head casting camshaft journal retainers where snapped , so bought a new complete head, it was an Ebay purchase , brand new complete with camshafts , all gapped up, but the CPS reluctance rings where not fitted?

I checked the old cams , and they have a cut out on the cams to align the spot on the rings , so installed as per the old cams .

I purchased all the tools,to correctly align the cams , crank position, and camshaft sprockets, and I'm damn sure they arte spot on, and after removing all the alignment tools did two rotations of the engine, and it still lined up.

However after installation, the engine will not start with the cam sensors fitted, but runs fine without them.

I dont get any errors via OBD with the cam sensors fitted,and have already replaced the crank sensor, but same issue?

I thinking now it's either theCPS rings , or if there is a procedure to tell the ECU to ignore the cam phasing and then do a relearn, but so far found no such procedure.

I'm planning to put an oscilloscope on the cam and crank sensors , and see if i can work out what the heck is going on?


Any help would be appreciated , before I junk a perfectly good clean car.

 

[scotman]

There is a calibration process that basically reassures the processor that the camshafts are in the correct position in relation to the crankshaft. All of this nonsense is required because Ford chose to engineer a engine without a key way machined into the crankshafts for the crankshaft pulley, which requires a tremendous amount of torque to secure properly. I believe that you almost have it, minus the recalibration

 

[cobra351w]

Hi Scotman,

I hope you are right , but I agree , a really stupid design , I'm still trying to determine Fords reasoning behind the design of the entire unit , it's almost a throw away engine , I guess if they had lasted long enough without the wetbelt issue, then maybe it would have lasted the life of the entire car.

Problem is now , with units failing with less than 50k on the clock , thats not an option, but stripping the engine down enough to change the belts is a major PITA, especially with the front cover access and the tools required to remove and refit the pulleys AND most of the bolts being stretch, and also have to be replaced.

I'm going to buy one those Hantek USB scopes , and look at the trigger output of the crank and Cam sensors ( I'll have to rig up an alternate supply to the cams as the engine wont run with them in) see if it looks logical.

I'm using the FORSCAN OBD scanner pc s/w , but there is no apparent crankshaft trigger trace available, which is odd?

If this was my Cobra , I could have used the onboard Megasquirt trigger viewer , but alas I can hack the ECU on this .

Cheers

Rob

 

[scotman]

Yeah. The 1.0 is a head scratcher! A friend of mine who is a BMW heavy technician said that the one liter is efficient but not designed to be long lived. Pretty much everyone over the age of forty years of age has had experience with earlier engines that were not super efficient but were long lived and reliable or at least easily maintained. I prefer the latter.