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Joined: Sep 2002
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Hard-core CEG\'er
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Hard-core CEG\'er
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You should have around 35-40 PSI at the fuel rail. If it just dribbled out, you don't have much pressure.
Do the pressure check.
Steve
98 Contour SE Sport 2.5 Duratec ATX The wifey's car
89 Taurus SHO - 246K miles
94 SHO ATX - 190K
1997 F-150 5.4L ATX - The Workhorse 150K.
ANY THREAD WITH "OMG" or "WTF" ETC IN THE TITLE WILL BE IGNORED!
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Joined: Nov 2005
Posts: 24
New CEG\'er
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OP
New CEG\'er
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Replaced fuel pump, car fired up running nice and smooth, 15seconds into startup it died, started it back up, ran 15 more seconds and then dies. The new IAC we put on makin a weird noise, so we put back the old one. wont even fire off old one, Defective new IAC???, Bad TPS? Dont make sense, getting fuel, geting spark, new IAC, new MAF, new gaskets on the upper end, new water pump, new fuel filter, new pcv, quadruple checked the vacuum lines, thinkin maybe we bumped one off, new plugs, new wires, , running out of things to replace here, LOL. Getting the essentials for it to run, but we think IAC may be problem. Any other things to look at? We may be over looking? SUggestons would be apprieciated. Thanks in advance. Ill say this once again, never had a car give me this much problems lol.
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Joined: Nov 2005
Posts: 24
New CEG\'er
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OP
New CEG\'er
Joined: Nov 2005
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Joined: Oct 2002
Posts: 2,408
Hard-core CEG'er
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Hard-core CEG'er
Joined: Oct 2002
Posts: 2,408 |
Originally posted by Halogram:
Replaced fuel pump, car fired up running nice and smooth, 15seconds into startup it died, started it back up, ran 15 more seconds and then dies. The new IAC we put on makin a weird noise, so we put back the old one. wont even fire off old one, Defective new IAC???, Bad TPS? Dont make sense, getting fuel, geting spark, new IAC, new MAF, new gaskets on the upper end, new water pump, new fuel filter, new pcv, quadruple checked the vacuum lines, thinkin maybe we bumped one off, new plugs, new wires, , running out of things to replace here, LOL. Getting the essentials for it to run, but we think IAC may be problem. Any other things to look at? We may be over looking? SUggestons would be apprieciated. Thanks in advance. Ill say this once again, never had a car give me this much problems lol.
The IAC is for idle only with foot off the pedal. Some Zetecs were equipped with a idle air bypass valve also.
When the engine is started it is running open loop. Depending on ECT data and warmup time of the heated O2 sensors, the engine will go closed loop. I would appear that this is when it dies.
To keep from replacing everything on the engine, I suggest attaching a recording scanner and starting the engine with your foot down some on the gas. The sensor data should reflect the problem at 15 seconds.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Joined: Nov 2005
Posts: 24
New CEG\'er
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New CEG\'er
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well the problem is , fuel pump was replaced, car fired right up without gas pedal assitance. ran great for 15 seconds or so, then died, figured ok restart it and give it light throttle to keep it running, seemed to make it worse. Pressure on the gas peddle made it stutter then die. No CEL at all during this stuff, either. From the first time it fired, to now, it hasnt throw a CEL at us, and its starting to annoy us. We got another IAC and havent put it on yet, the old IAC is still on the car. We figured the car has 140k on it, just replace all visible vacuum lines, rubber ones, since that is very inexpensive and see what that does.It doesnt add up, First time car s together, firesd up runs as smooth as can be, then it got to operating temperature, drove it around the block 2 times, idle went bad, rough idle, clattering noise, would stall occassionally. Then we narrowed it down to IAC since it has almost every sensor replaced on the engine, new IAC on, wouldnt idle anymore, would run when you put the throttle down alittle bit. But far as idling it wouldnt, so we turned to the fuel pump, we were right there, was getting crap for pressure. Replaced it, car fired up without pedal assistance, and ran for 15 seconds or so, and just died, started it up again, this time put slight pressure on gas pedal to keep it from dying, didnt work. Sounds like to us its a vacuum leak or hate to say it, cracked head????? Didnt decide to show its ugly face till the engine got to operating temp. Dont know but Ive not read alot of problems with these heads cracking or am I just that blind? lol Thats where the car sits now, Cranks, starts but wont idle nor can you give it gas to keep it running. ANy other suggestions, besides putting it in the pasture and shooting it. Im out of ideas. 
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Joined: Oct 2004
Posts: 1,456
Hard-core CEG\'er
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Hard-core CEG\'er
Joined: Oct 2004
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Is the oil level where it should be? Worth a look if you haven't checked it. Did you align the IAC when reinstalling it? Also, maybe the alternator isn't charging up, try charging the battery fully with a charger, so the battery has capacity to run the car a while, and check the voltage at the battery terminals is above 14 volts.
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