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Ford Explorer 2003 no start - engine rotates


12field
01-08-2010, 06:28 PM
I have spark - not sure about fuel but sprayed starting fluiding into intake and did not get any firing. Oil and coolant looks good so do not think headgasket is problem. Vehicle shut off once and restarted, got it home but cannot get it to fire again. Any ideas would be greatly appreciated! Thanks!

danielsatur
01-08-2010, 06:29 PM
Symptoms of a bad or dirty maf

danielsatur
01-08-2010, 06:31 PM
Hard cold start is a symptom of a bad, or dirty MAF sensor.
The air is metered, it sends a cold start signal to the PCU/ECU.

12field
01-08-2010, 06:35 PM
Symptoms of a bad or dirty maf

Wouldn't I get some firing from the starting fluid? Thanks for reply.

danielsatur
01-08-2010, 06:58 PM
The Air/fuel mix is set by the ECU/PCU during the cold start conditon, the fuel pulse is long + starting fluid = flood!

The MAF sensor is a metering device for air, a cold start signal is like telling the ECU/PCU that you need a choking condition for a cold start.

If not a bad MAF sensor, it could be unmetered air leaks.

Davescort97
01-08-2010, 08:56 PM
A dirty MAF sensor will cause an overly rich mixture upon trying to start. Get some electronics cleaner spray and clean the MAF wire inside the housing. If you want you could pull a plug and see if it is wet with gas. If this occurs it is a good indicator that the MAF is dirty. btw. If you unplug the MAF sensor it will send a rich mixture to the computer by default.

danielsatur
01-08-2010, 09:01 PM
The PCV system will actually contaminate both sensors.

rhandwor
01-08-2010, 09:34 PM
Are you getting any indication of a security problem. These will cause no starts.

shorod
01-08-2010, 10:20 PM
And don't rule out a bad crankshaft position sensor. These have been known to cause issues on the earlier Explorers. I'm not so sure if they were still common issues on the 2003 and newer model.

Which engine is in your Explorer?

-Rod

12field
01-09-2010, 10:19 PM
And don't rule out a bad crankshaft position sensor. These have been known to cause issues on the earlier Explorers. I'm not so sure if they were still common issues on the 2003 and newer model.

Which engine is in your Explorer?

-Rod

THanks for all the good ideas. Today, I cleaned the MAF, confirmed spark and fuel into cylinder and still no firing. Would a bad crakshaft sensor prevent spark as I have it? Any other ideas out there would be great. THANKS!

12field
01-09-2010, 10:20 PM
Are you getting any indication of a security problem. These will cause no starts.


I will check on this tomorrow. THANKS!

12field
01-09-2010, 10:21 PM
The PCV system will actually contaminate both sensors.


I will replace it as cheap. Would this prevent firing as I appear to have both fuel and spark.

Davescort97
01-10-2010, 02:37 AM
More than likely it is the CKP sensor sending spark at the wrong time.

12field
01-11-2010, 08:40 PM
More than likely it is the CKP sensor sending spark at the wrong time.

We replaced the cam positioner sensor but no luck. The MAF was only cleaned and not replaced but did not seem to matter- plugs were wetted but not fouled so should have got a fire out of it. A ticking type noise seems to be coming from front end of engine. Security is not the problem - no lights anyway. Any other ideas would be appreciated. Thanks

12field
01-11-2010, 08:40 PM
More than likely it is the CKP sensor sending spark at the wrong time.

We replaced the cam positioner sensor but no luck. The MAF was only cleaned and not replaced but did not seem to matter- plugs were wetted but not fouled so should have got a fire out of it. A ticking type noise seems to be coming from front end of engine. Security is not the problem - no lights anyway. Any other ideas would be appreciated. Thanks

shorod
01-11-2010, 10:36 PM
Did you replace the camshaft position sensor or the crankshaft position sensor? We suggest the Crankshaft Position Sensor (CKP).

-Rod

12field
01-11-2010, 10:49 PM
Did you replace the camshaft position sensor or the crankshaft position sensor? We suggest the Crankshaft Position Sensor (CKP).

-Rod

Crankshaft, is there one for camshaft that could be the problem? Could it be timing belt- is that easy to check for? Any help would be greatly appreciated. THANKS

shorod
01-12-2010, 07:39 AM
We replaced the cam positioner sensor but no luck. The MAF was only cleaned and not replaced but did not seem to matter- plugs were wetted but not fouled so should have got a fire out of it. A ticking type noise seems to be coming from front end of engine. Security is not the problem - no lights anyway. Any other ideas would be appreciated. Thanks

You previously posted that you changed the cam sensor, that's why I asked.

Yes, the camshaft position sensor (CMP) could impact fuel injector timing. The spark timing is controlled by the CKP and the CKP is much more common to fail.

Have you checked for any stored or pending diagnostic codes?

-Rod

12field
01-12-2010, 01:14 PM
You previously posted that you changed the cam sensor, that's why I asked.

Yes, the camshaft position sensor (CMP) could impact fuel injector timing. The spark timing is controlled by the CKP and the CKP is much more common to fail.

Have you checked for any stored or pending diagnostic codes?

-Rod

Yes, you right - I got the sensor mixed up. My friend, the Explorer owner, now says he has had a noise the past couple months prior to this problem. Sounds like the timing belt or chain is loose or broken. If you or anyone knows an easy way to change this it would be appreciated. Thanks for help so far. No error codes accessed since it is stuck in his garage and we do not have a code reader.

rhandwor
01-12-2010, 01:52 PM
I would do a compression test before buying sensors if you think a timing chain is broken.

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