Cranks, no start

algershick · Sep 14, 2023

Hey guys, I bought this 2011 Fiesta last year for my daughter and after replacing the clutch (DPS6 life) its been relatively problem free.

Yesterday evening my daughter was headed home from school and the serpentine belt broke on her and the engine shut down. She reported hearing a noise (which I believe was the belt coming apart) and rolled to a stop shortly after.

I verified charge on the battery which is showing 12.3 volts. Before replacing the belt, I tried to start the car to see if I could limp it home on the battery and it wouldn't start. I've got the serpentine belt replaced but again, the engine cranks but will not fire.

I'm about to head back out there now and see if I can pull any codes, but has anyone experienced something like this in their Fiesta?

I appreciate the help!

algershick · Sep 16, 2023

I'm going to keep this post updated so hopefully it may help another Fiesta owner at some point.

The car is producing 2 codes verified with Forscan. P0340 AND P0365 which are both camshaft position sensor codes. I swapped the 2 sensors and the same codes persisted.

I pulled the valve cover and verified that the cams are out of time. The red lines should be in line with each other in my photo.

Serpentine belt material wadded up behind my crank pulley and likely caused some friction, then the timing belt jumped.

algershick · Sep 16, 2023

Worst case the valves crashed and I've got serious issues in the head. I'll inspect further with a borescope tonight.

Best case I jumped one tooth on the belt and no interference occurred.

Ive ordered a new timing belt/tensioner and water pump and will update after I get the car back together.

thebicman · Sep 19, 2023

If you haven't done a fiesta timing belt before I recommend the tool which locks the flywheel. Makes tightening the flywheel bolt so much easier.

algershick · Sep 23, 2023

thebicman said:
If you haven't done a fiesta timing belt before I recommend the tool which locks the flywheel. Makes tightening the flywheel bolt so much easier.

I appreciate that!

I did borescope the cylinders and saw that all of the valves hit the pistons unfortunately, so a new set of valves is on order. Nothing else appears damaged.

TLDR for anyone encountering a no start condition after throwing a serpentine belt:
Your serpentine belt likely got wrapped up around the balancer and caused your timing belt to skip, then your valves crashed into your pistons and will have to be replaced.

algershick · Sep 23, 2023

thebicman · Sep 24, 2023

That sucks. Definetely more work for you to get it running again. What about a used head?

Cranks, no start

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