Hesitation Problem
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Hesitation Problem
I have a 1998 Eddie Bauer Expedition with a 5.4L engine. Lately, I have noticed that if the truck sits all night in the rain, or it is extremely humid outside, I get hesitation on take-off. This starts after about 10 mins of driving and is gone after another 30 mins of driving. I changed to super unleaded gas (ouch!). I still have the problem. In good weather (no rain and average humidity) there is no sign of the problem. I'm not getting any check engine light where I could get a code. The engine is stock with the only mod being a K & N Air Filter. This problem is driving me crazy. I hope someone else has had or seen this issue and can point me in the right direction.
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I had it in the shop this morning. The removed the spark plug boots and put di-electric grease on the boots, but this has not solved the problem. My gas mileage is crappy, and this problem is driving me crazy. What is the ECM?
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About 2 years ago, I replaced the pcv valve/hose assembly (the elbow bend was melted away causing rough idle). I checked this morning, and another soft rubber bend has softened and collapsed. Would this cause my problem?
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I was speaking with a mechanic at the local shop who own a 1998 Navigator with the 5.4L engine. He was telling me that when he had this problem the solution was to replace all 4 oxygen sensors, and the problem vanished. I have had cars with bad oxygen sensors, but it didn't affect the way they run. Can someone tell me if this sounds right?
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Update: I took my truck in to be diagnosed on Wed. The mechanic called me and said that he was checking the fuel injectors. He removed the #1 injector and put it back, he removed the #2 injector and put it back. He went to remove the #1 injector again, and the engine smoothed out and ran fine. I got the truck back, and it is fine with the exception of a small hesitation if I get on the gas hard. If I ease down on the gas, there is no problem at all. Any further suggestions?
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From: Chattanooga, TN
Originally Posted by Deacon Stanley
Update: I took my truck in to be diagnosed on Wed. The mechanic called me and said that he was checking the fuel injectors. He removed the #1 injector and put it back, he removed the #2 injector and put it back. He went to remove the #1 injector again, and the engine smoothed out and ran fine. I got the truck back, and it is fine with the exception of a small hesitation if I get on the gas hard. If I ease down on the gas, there is no problem at all. Any further suggestions?
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From: Chattanooga, TN
Originally Posted by Deacon Stanley
I was speaking with a mechanic at the local shop who own a 1998 Navigator with the 5.4L engine. He was telling me that when he had this problem the solution was to replace all 4 oxygen sensors, and the problem vanished. I have had cars with bad oxygen sensors, but it didn't affect the way they run. Can someone tell me if this sounds right?
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I had the same problem with my 5.4L '99 EB. It would start after the truck would warm up and if i was crusing at 40mph and went to speed up it would start to hesitate and it ended up being a bad coil pack on cyl #2. The dealer replaced the pack and solved my problem.
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I have a 99 F-150 Lariot and now I have a check Eng light ....had a diagnostic and was told it was my O2 sensors.....he said I had 4...I was shocked...I thought I only had two.....after reading it looks like I do have 4.....I dont think replacing them will be bad....and I need to do it soon....rough Idle and even shuts off at red lights.....
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I found another vacuum leak and fixed it. That solved all of the issues with the way the truck runs. I cleared the CEL. I got it back now, with codes P0171&P1074, but no issues with the way the truck is running.
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From: North Texas
Glad you're running right again.
For the problem when it rains:
I've heard of some hose leakage right above #1; could cause rust, etc. You also may want to put a water hose to your windshield and check for leaks into your engine compartment. Just my 2 cents...
For the problem when it rains:
I've heard of some hose leakage right above #1; could cause rust, etc. You also may want to put a water hose to your windshield and check for leaks into your engine compartment. Just my 2 cents...
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Originally Posted by WillDog
Why didn't he replace the #1 injector then and there? Sounds like the possibility that you have a partially clogged injector. You can run a can of Techron through the tank. Sometimes it will clean a partially clogged injector. If it doesn't fix the problem, at least it won't hurt anything. I have cleared up very minor induction problems with it in the past. Would be worth a try.