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Why wont my vehicle start? Answered

i have a 2003 ford explorer it ran hot a few times then one time going down the road it had just shut down. we replaced to water pump, thermostat and the heating sensor. we had it running once or twice for about 15 min and then it would die. now it will turn over but will not start. pls help me!!!!

Tags:suv

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cerberustugowar
cerberustugowar

8 years ago

Start with the basics. At work, I do this daily on all units I have to work on. Is your fuel good, Is the oil level correct and good, check spark, check compression. If all of those are good, it should at least start, if it doesn't dig deeper. Spark bad on one cylinder, check the plug, and wire. Spark bad on all cylinders, you likely didn't have all your spark plugs and wires die at the same time, so you have to trace back further.. Electronic control unit, sensors, electrical wires? Compression bad on some cylinders, do a leak down test on them. Gas smells ok or you know its fresh, check the fuel system, is it getting to the carb, is the carb clean, is the air filter dirty, etc. Try some of the basic things everyone has suggested then report back on here, then we can come up with more directed trouble shooting and ideas.

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Vyger
Vyger

8 years ago

A forth player to the fuel, air, spark is compression. If it was overheating even with a good water pump and cooling system that might indicate a bad head gasket. Compression leaking into the water jacket pressurizes the water and stops the pump. It also drops the compression to the point where it can't ignite. Pull the spark plugs and check the compression of each cylinder.

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cerberustugowar
cerberustugowar

Answer 8 years ago

Glad to see someone didn't forget the factor of compression in the equation. Spark, correct fuel/air mixture and compression are the 3 things needed as I say.

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assie84
assie84

Answer 8 years ago

Thank u forthe help will try.

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RedneckEngineer
RedneckEngineer

8 years ago

There are sooooo many things it could be its hard to guess without being there. You've said your getting spark so that leaves two other possible places, air and gas. Check the fuel filter and pump to ensure that it is getting gas. Check the compression as someone else stated but I'm wondering, have you checked to see if its in time?

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framistan
framistan

8 years ago

You should determine if the problem is in the fuel system or in the spark going to the plugs. You could do one of these 2 things to determine that. spray some starting fluid into the carbeurator AIR-INTAKE then try cranking the motor. If it starts and runs ONLY WHILE YOU SPRAY the starting fluid then the problem has something to do with NO GAS GETTING TO THE CARBEURATOR. The spark and sparkplugs must be working OK. OR... you could alternatively REMOVE one of the plugs. Leave the plug wire attached. Lay the metal part of the plug against a METAL part. Crank the motor (do not be HOLDING the plug or you will get shocked badly) While someone turns the key to crank the motor, watch the spark plug to see if you are getting a SPARK. If you are getting a spark... the problem is most likely NO GAS going to the carbeurator. One time, my brother had a car that would START but would only run a minute or 2. He finally figured out that the GAS CAP had a faulty vent hole that was clogged. This caused the car to run, but NO AIR could go into the tank as fuel was used. When the gastank got too much suction pressure on it, the motor would stop running. He fixed it by getting a new gas cap. You can test for this by removing your gas cap. If you hear an AIR SUCTION sound when you remove the gascap, then THAT IS THE PROBLEM. At least, this can help you narrow the problem down between FUEL or SPARK. (PS... I assume the car is GAS powered, not DIESEL) if it is DIESEL, please disregard this advice, as I don't have knowledge of diesel engines)

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assie84
assie84

Answer 8 years ago

We have checked the spark plugs and they are getting fire. Does the ignition have anything to do with it?

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assie84
assie84

Answer 8 years ago

We have a obei scanner and put it on the truck when we had it running and no codes came up. The check engine light would come on and off all the time before the truck broke down.

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Jack A Lopez
Jack A Lopez

8 years ago

Does the engine control computer have anything to say? 

I mean has it turned on the check-engine light, thus prompting you to connect a scan tool to its little diagnostic port,
http://en.wikipedia.org/wiki/On-board_diagnostics#Hand-held_Scan_Tools
for to download any cryptic error messages it might have left for you?

If not, then I dunno...  Maybe Framistan has some good advice for you, basically asking you to ponder the Holy Trinity of Fuel, Air, and Spark

All three of these are necessary to make the little explosions necessary for to propel your Ford Exploder down the road, as is true of any machine powered by an ICE (internal combustion engine).


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assie84
assie84

Answer 8 years ago

Thank you!!!