Skip the auto shop - Our mechanics make house calls

Q: Car starts but will not run

asked by on

I have replaced ignition module, fuel filter and pump, also the map sensor and tps sensor I believe the ecu is bad
My car has an automatic transmission.

You should not replace any parts, at all, unless the part is diagnosed as not functioning. ECU’s rarely fail (fully 50% of warranty returns on ECU’s have absolutely nothing wrong with them).

If there is a spark at the plug (the plugs themselves have to be evaluating for possible fouling) and there is fuel supplied to working fuel injectors (there could be fuel pressure but injectors might not be functioning due to electrical fault) and the engine doesn’t start, that means there is a mechanical problem.

But, I would first check to see if the injectors actually function. One way to quickly determine if it is a fuel versus ignition issue is to introduce starting fluid into the intake. If the engine runs momentarily using starting fluid, that means that you have a fuel supply issue.

YourMechanic deals with hundreds of no start diagnoses daily and could diagnosis the trouble you are having in a quick mobile visit to your home.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: The battery light came on on my 2012 dodge charger after it seemed to turn off while i was driving. The car turned off after i spe

This can happen when the charging system is having trouble maintaining a specific voltage which is what causes the battery light to come on. This can also happen when the voltage regulator is failing or weak. This regulates the charging...

Q: Center console has no power

When dealing with a group of electronics that has no power, the first thing I check is the fuse. After that, I would urge you to hire a certified mechanic to run an inspection on your electrical system. From there,...

Q: Pin in ECU connection broke and car won't start

This sounds like a pretty big deal. If the pin is one the connector side, you may be able to simply replace it with a new pig tail end. If the broken pin is in the ECU, unfortunately the ECU...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...