1998 Ford Expedition shaking

BRUCECRUMP

MEMBER
1998 FORD EXPEDITION
V8
4WD
AUTOMATIC
155,000 MILES

Hello.
Please help. I was driving home from grocery shopping a week ago and my engine began shaking and had a loss of power. It only did this while at low RPM's. Like after going into 3rd gear at 30mphs for example, but it will do it in any gear. My check engine light came on 5-6 months ago. I got a OBD2 scanner and it said bad ignition coil and bad egr flow. I ended up raplacing the ignition coil #3, DPFE solinoid sensor and EGR solinoid, the EGR valve was working. The check engine light went off but problem was still there, so I replaced the following. The rest of the ignition coil boots with springs, pcv valve, spark plugs, oil filter, oil. I repaired all the vacume leaks, cleaned the MAF sensore with special cleaner. Im out of options. No codes show up anymore on my scanner and the problem is still there. I tried to explain it to a mechanic, but they still insist I spend the money for all the diagnostice to even get started. I have alread spent over $300 on this project and I just got layed off 3 weeks ago. Im in a bad spot and cant afford to start over at a mechanic. Could you throw some ideas at me, or give me some ideas of things I can check. I have googled a hundred different ways and only thing left I can think of are the cylinders themselves. PLEASE help. Thanks in advance. PS. Could a leaky EGR valve cause this problem?

6 Replies

JACOBANDNICKOLAS

MECHANIC
108,310 POSTS

It could be many things. First, I would switch the new coil with one of the old ones to see if it then sets a code on a different cylender thinking you may have gotten a bad one. Also, did you replace the plugs when you replaced the coils? Have you checked fuel pump pressure? As far as the EGR, it can cause problems. Have you removed it to check and clean it. Finally, have you checked the catylatic converter to make sure it isn't plugging?

Let me know. We'll figure it out, and thanks for using 2carpros. Com.

Joe

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Monday, February 1st, 2010 AT 7:18 PM

BRUCECRUMP

MEMBER
4 POSTS

Yes, I changed plugs and re arranged coils when I installed new boots on them. The EGR valve was working, I even put some cleaner in it and it did not leak until I put vacume on it and it opened like it should. I have an OBD 2 live data that I ran with it on and the MAF and everything looked correct. I have eliminated everything I could think of, and no codes are showing. Im usually pretty good at this stuff, but this has me stumped. I ordered a compression tester.
One thing I forgot to mention is that after I got my Ford home. It sat a few days while I waited for parts. When I was done with plugs and egr, I started it up and there is a high pitched metallic noise comming from passenger side head area. It goes away at about 4000 rpms and when the engine heats up. It was not there before. Maybe bearing or valve? BTW Its not throwing any codes. Even when it startes shaking and losing power.

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Wednesday, February 3rd, 2010 AT 1:39 AM

JACOBANDNICKOLAS

MECHANIC
108,310 POSTS

Could it be cam bearings or is it a ticking? Also, have you checked the catylatic converter?

Sorry for all the questions. I'm just trying to eliminate as much as I can.

Joe

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Wednesday, February 3rd, 2010 AT 10:50 AM

BRUCECRUMP

MEMBER
4 POSTS

Its a whining sound, almost like a sqeaky belt. Only way I can describe it. I have not checked the converter yet. I did have a flashback however. My wife drives this car most of the time and likes to run it on empty. I usually cover all three elements when troubleshooting. Air, gas, elect. I was wrapped around the EGR and COP that I overlooked the fuel. When it started shaking as I recall, it had maybe a gal gas, and I was heading to station before I headed home from store. It sat with very little fuel for about an hour of grocery shopping. Im thinking maybe all the sediments that float around made their way into the fuel system. So I replaced the fuel filter and finished rebuilding and cleaning injectors when the sun went down. Im going to install them and give it a go. I well let you know how that goes. Also, what should I do to check converter? Shouldnt that show up on OBD2?

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Thursday, February 4th, 2010 AT 1:30 AM

BRUCECRUMP

MEMBER
4 POSTS

Ok, so I test drove it and its better. Not shaking voilently. But still having prob. Whenever it shifts into higher gear (automatic) and puts a load on the engine, then it rumbles like a manual transmission starting out it 3rd. Its just not getting everything it needs. Another thing is it only does this when engine warms up. I drove it for awhile and finally got it to throw a lean bank 1 code. I have replaced everything that I possible can think off.