2002 Ford Explorer hard starting in cold weather

Tiny
PAT148SAN
  • MEMBER
  • 2002 FORD EXPLORER
Engine Performance problem
2002 Ford Explorer 6 cyl Four Wheel Drive Automatic 75 k miles

I have a 2002 ford explorer v6 automatic transmission 4 wheel drive. Whenever the temperature goes below 40 degrees I have to crank 20-25 seconds before it starts. In warmer temperature it starts within 1-2 seconds. The colder it gets the longer it takes to start I was told that the check valve in the fuel pump wasn't holding pressure in the fuel injector line. I was told that I have to replace the fuel pump. If it was the check valve or fuel pump wouldn't I have the same problem all of the time summer or winter? This hard starting is effecting my remote start. When the car doesn't start we do have spark when cracking. The tk. Runs excellent it is very well maine All summer it starts fast and my remote works well
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Thursday, October 23rd, 2008 AT 7:19 PM

9 Replies

Tiny
JACK42
  • MEMBER
Then you need to get a manual fuel pressure gauge on it to verify fuel pressure. It could be the pump, temp can make parts do strange things. Any check engine light? If so have it scanned for codes
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Friday, October 24th, 2008 AT 8:08 AM
Tiny
PAT148SAN
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No check engine lite on any time. Put pressure gauge on an is with in fact spects. After laying long time over nite pressure drops I cycle key on pressure is ok same test was done summer an winter but only cold weather gives me the problem
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Saturday, October 25th, 2008 AT 2:03 PM
Tiny
JACK42
  • MEMBER
Migt be a coolant sensor out of range a little bit. Im in socal, so I dont really have to deal with cold-start problems all that much. If the fuel pressure comes right up when key is turned on, then the pump may be ok, but if it bleeds off to 0 overnight it will haev asmall amount of air in the lines that it will have to purge before it will start
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Sunday, October 26th, 2008 AT 8:11 AM
Tiny
PAT148SAN
  • MEMBER
If your not an expert on fuel delivery please ask an expert. I replaced the fuel pump, regulator, and filter, and I still have the same problem. The pressure still drops to zero over night. The mechanic installed a pressure gauge and cycled the key two or three times and the pressure comes up to factory spects. The next test the mechanic did was removing all spark plugs to check if any fuel sprays out of any of the cylinders while the fuel pump is disconnected. Trying to eliminate if there was a fuel injector leak, it was okay. Replaced spark plugs next over night laying the fuel pressure was down, we cranked the engine until it started, after about 15-20 seconds it started up and ran smooth with no rich condition. Please help my car will not start with my remote. It starts them shuts down after two or three times. The mechanic doesn't know why it's losing pressure over night. There are no leaks in any of the lines. Or injectors Please reply.
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Tuesday, November 11th, 2008 AT 5:15 PM
Tiny
MASTERTECHTIM
  • MEMBER
After the tech cycled the key a few times and the fuel pressure was in specs did the truck start right up or did it still have a 30 second delay in starting? Im with jack on looking at coolant temp sensor. I have seen these pressures drop to 0 overnight but as soon as the key is turned to run the fuel pump energizes the system real fast and builds up good pressure. The extended crank then could be from a coolant temp sensor reading too high, for example the computer will hold injectors open a lot longer in colder weather(acting like a choke) but if the coolant temp sensor is reading 70 degrees when its really 40 then the injectors would be too lean to start the cold engine thus the extended crank time. But after 20 to 30m seconds the cylinders would be wet enough to start from the lean injectors and then would run ok for the rest of the day.
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Tuesday, November 11th, 2008 AT 5:35 PM
Tiny
PAT148SAN
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Yes tk. Starts after cycling 3 or 4 times / mech. Said coolant tem. Is in spects. He all so said he checked other cars in shop for pressure drop over night an found to his surprise that all of them dropped considerable but had no problem starting. I have no check engine lite on at any time runs great. Is it possible iac isn't working right all though mech. Said the counts are ok what ever that means. Please help so far invested over five hundred dollars an still have problem. Even ford dealer don't know said I had to leave it u know what that means so I didn't
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Friday, November 14th, 2008 AT 12:45 PM
Tiny
MASTERTECHTIM
  • MEMBER
Well first off when turning key to run position we need to know that we are getting 12 volts to fuel pump and make sure the ground is really good. One cycle of the key will bring the system up to pressure, even if its zero to begin with. Thats next step of diagnosis. If it was a iac problem then lightly stepping on gas pedal to open the thrpottle a little will make truck start right up.
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Friday, November 14th, 2008 AT 2:34 PM
Tiny
PAT148SAN
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( Here is what I seen with gauge hooked up at zero pressure one cycle of key on I heard pump run for about one to seconds pressure went 35 pounds then shut off witch means pump worked then he crank engine about 3 seconds more reached normal normal spects an started right up. If u think I should try coolant switch I will but mech. Said buy his monitor out side temp. Was the same if it was a ground wouldn't I have other problems
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Friday, November 14th, 2008 AT 6:19 PM
Tiny
MASTERTECHTIM
  • MEMBER
Fuel pump relay should energize fuel pump for a full 2 seconds and 3 seconds of cranking seems acceptable. If intake air temp and coolant temp are the same then that eliminates them. To check the ground with a meter you should not have no more than.5 volts on ground wire. If you have more than point 5 volts then there is too much resistance in ground. Im confused about actual condition. Original complaint of 20 to 30 seconds to start when cold. When this happens do you have fuel pressure? Even cranking engine over without letting fuel pump relay run you whould still get fuel pressure in a few seconds and run, are you getting fuel pressure? Also you can have tech check mass air flow sensor, calculated engine load he can read on the scanner and with key on engine off when its cold we need to find out what calc eng load is, it should be zero, if we have a dirty mass air flow sensor and its reading any load then this will lower injector pulse width and cause extended crank too.
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Friday, November 14th, 2008 AT 6:36 PM

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