Skip the auto shop - Our mechanics make house calls

Q: Can't Start Engine after rebuild

asked by on

We had to replace the head gasket due to a compression leak in #5 to the cooling system. (Before this happened the car ran great with no problems). We disconnected the battery, stripped the engine down, had the head re-ground at an engine shop. Replaced the head bolts, gaskets, plugs etc. and put everything back together.
Then it wouldn't start. 1) We checked the fuel pump system and ECM relay drive. The fuel pumps runs during cranking. 2) We checked the fuel injectors with a test light. When cranking, they flashed 2 times in the first 2 seconds. 3) We tested the pick up sensor with a 1 volt meter. Manually turned the engine, the meter moved indicating a pulse. 4) Using an old time timing light tested the coil / spark output. While cranking, it flashed a couple of times in the first 2 seconds. 5) We check the MAP sensor and other sensors 5 / 12 volt power sources and ground. Our problem is when we crank the engine, the ECM will only fire for the first 2 seconds and then nothing

My car has 120000 miles.
My car has an automatic transmission.

A: Hi - congrats on being very thorough with y...

Hi - congrats on being very thorough with your testing! If you spritz some starter fluid into the throttle body, will this start it for a second or two? That would confirm the total of your testing - that you have spark and fuel (temporarily) - resulting in combustion. If spraying gas into the throttle body allows the engine to run longer, you have isolated the problem to fuel supply. Coolant sensor failures (the sensor for engine management, not the gauge) are known for causing ECM problems with this engine, and it’s possible the ECM is bad period. I would recommend having a Car Is Not Starting Inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem if you are requiring of further assistance.

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

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: had car for 5 days, then suddenly stalled leaving me stranded. Engine wont turn over to start

First, let me say I am sorry you are having an auto repair experience like this. This is not the kind of thing I like to hear about. To answer your question about the hole in the oil pan,...

Q: change motors

The two motors are very different in width and the 4.3 is longer also. It would not bolt to the bell housing of the 2.8 and the two flywheels are different. The 95 4.3 wire harness is very different along...

Q: What is causing the truck to not start? 1995 Ford F-150

Hi there. It sounds like either a battery or starter that is faulty. Perform a test on the battery with a digital battery tester that provides the cold cranking amps and state of health. Then perform a voltage drop test...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.