1993 4.9L intermittent miss
#1
1993 4.9L intermittent miss
Hi all, I asked this last year under engines and didn't get a lot of hits. I have a 1993 F150 4.9L 5 speed with @ 73,000 miles and for the most part it runs good. The problem I have is I have an intermittent miss after the engine warms up. It is more noticeable in warmer weather, which I found strange. Just gave it a complete tuneup which didn't help. I had a couple error codes pop up awhile ago
and they both referenced the EGR valve. I had taken it apart and checked and it seemed o.k. but I am wondering if that could be it. Thanks for any help.
and they both referenced the EGR valve. I had taken it apart and checked and it seemed o.k. but I am wondering if that could be it. Thanks for any help.
#2
#3
Hi Colorado, thanks for the reply! Strangly enough it is only noticeable when cruising @ 35-45 mph. It idles fine and runs strong, just a period of misses here and there. I thought maybe it was happening when the egr valve was attempting to open? Like I said it is more annoying than anything. I have run some fuel injector cleaner through a couple of times but never professionally cleaned. Thanks
#6
My truck with the 5.8 had a similar issue, which like you said was more of an annoyance than a real problem so I didn't do anything about it. Eventually the CEL tripped, throwing a bad O2 sensor code. Replaced that, problem vanished.
Thing is, I had to get a local shop to remove the O2 sensor off the y-pipe, it was practically welded in there. Even the right size deep socket ended up rounding off the hex, so be careful. Start spraying PBlaster on it like a month before you hope to get it off.
Thing is, I had to get a local shop to remove the O2 sensor off the y-pipe, it was practically welded in there. Even the right size deep socket ended up rounding off the hex, so be careful. Start spraying PBlaster on it like a month before you hope to get it off.
#7
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Well, thanks for all the advice guys but sadly, and I do mean sadly, my truck was totaled coming home from work today. Once again was in the wrong place at the wrong time. Such a shame too, that was the best vehicle I ever had new or used. Time to go and drink some beer and cry. Thanks again
#13
Sorry to hear that, but these trucks are dime-a-dozen around here. I can think of 3 off the top of my head I've seen out for sale within about 10 miles of my house.
You shouldn't have much trouble finding another one if you need a truck. Otherwise, buy a motorcycle! They pay for themselves in a year or two in gas savings. Many newer bikes push 60 MPG, and smaller ones(<500cc) can get into the 70's. Better than 12 in one of these trucks :P
You shouldn't have much trouble finding another one if you need a truck. Otherwise, buy a motorcycle! They pay for themselves in a year or two in gas savings. Many newer bikes push 60 MPG, and smaller ones(<500cc) can get into the 70's. Better than 12 in one of these trucks :P