Skip the auto shop - Our mechanics make house calls

Q: Car wont start after replacing timing belt but I know timing is spot on. What could it be?

asked by on

After replacing the timing belt, water pump, cam and crank seals, valve cover gaskets the car wont start. It cranks and tries to sputter and start but just wont do it. I have checked the timing over and over and find all the marks lining up every time. I have checked for spark from all plugs, wires and coil packs but they are ok. I have also tried taking the throttle bottle and intake tube off to see if I have missed and wire connectors and I cant seem to find any anywhere that I missed. Is it possible something else went bad just out of nowhere? It drove into the shop just fine right before I started the job. PCV valve is broken off and not connected, would that cause it to not start, because I dont think that would affect it that way. Any and all advice is greatly accepted and appreciated.

My car has 150000 miles.
My car has an automatic transmission.

A: Hi there, thanks for writing in. Well if t...

Hi there, thanks for writing in.

Well if the car ran before you did the timing belt, but now doesn't run after, I am or course going to say that the likely scenario is that the timing is off. Make double and triple sure that you're using the correct marks on the camshafts and crankshaft, and make sure that the belt is properly tensioned. If all this is correct, it's not impossible that something else failed, just highly unlikely. The next step after verifying the timing is correct would be to check fuel pressure and run a compression check. You would normally want to check for spark, but you have already done that. If the timing belt was off before and you turned it over at all, it could have damaged valves and that would cause the motor to have no compression. If these checks don't yield any results, then you should consider contacting a professional technician, such as one available from YourMechanic, to diagnose the no start condition.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: ac compressor goes bad for the second time and burns out

It sounds like you have more problems than a compressor. Did you flush out the A/C system, replace the orfice tube, replace the accumulator, add oil before replacing the compressor, and then evacuate and recharge the system? If this was...

Q: Car is not starting battery is good and can hear the turnover

Hello there, Many faults will cause your 2008 BMW 328i crank, but not start. The first step would be ruling out the battery with a load test, this will tell the charge and battery output, indicating if it is able...

Q: Hybrid vehicle has coolant leakage from the transaxle

Hello. If the system is leaking coolant then the leak needs to be found immediately. If it is leaking from around the transmission area then it is usually either the external pump or the inverter. These inverters are a common...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...