Escort :: 97 2.0 SOHC Lost Compression On Cylinder 4 / Car Started Throwing PO304
Feb 20, 2012
Car started throwing PO304 and checked coil, plugs, wires and injectors before finally checking compression. Checked #4 and it was 70. Checked #3 and it was 150 something. Got mad and quit
3 weeks ago the CEL started coming on only when i was low in a gear. Like rolling to a stop sign and taking off in 2nd instead of 1st. Dogging the car to avoid downshifting i guess i would say. Car would jerk like crazy and throw a code but would drive out of the jerking and run fine.
There are no loud noises coming from the valves. Engine runs a lil rough at idle but you would not notice it after you get going. Spark plug #4 had some oil on the threads, others did not. No antifreeze in oil, looks good. Throws PO304 constantly now..
Buddy came over and said he would first check the timing belt to see if it had slipped before digging into the head. To tell the truth, i probably will not be digging into the head anyway's. I probably could not find the problem anyways.
Just wondering what could be some realistic explanations for losing most compression on one cylinder. Could the valve seat be getting ready to go or is that a all or none type of deal?
This is a 97 wagon with 314,000 miles. I am getting 37 MPG and it drives straight as an arrow. Just replaced all tie rods and brakes and had her front end aligned and this is how she treats me. Would like to save this car as i really like it for my 700 miles a week commute to work. Judging the price of used cars nowdays, i have thought about replacing the engine with a used one if it comes to that but we will have to see.
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For the past few days I've been trying to track down the problem with my '02 Ford Escort. First thing I did was change the spark plugs which smoothed out the engine some, but I still have the PO304 (misfire #4 cylinder). Next I swapped the plug wires between #3 and #4 and reset the ECU hoping the code would come back PO303 (misfire #3 cylinder), yet it still set a code for cylinder #4 meaning the plug wires were good. I then tested the coil and camshaft position sensor which both tested good.
After this I checked the compression on #4 and it was good at 175 PSI. When I removed the #4 plug to test the compression it was gas soaked so the injector is firing, but apparently not the plug. My Chilton's manual says the center pin (ignition/start/run) on the wiring harness for the coil should have 10 volts with the ignition switch in the off position. I checked this and only had 0.1 volts. Where this wire receives it's voltage from and able to tell me more about what to look for or test? I never expected to have so much problem finding a cylinder misfire.
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About a week ago I was driving my Pontiac 2003 Grand Am V6 and it began to violently shake and the "check engine light" came on and started blinking. I then immediately took it to the mechanic It has been with the mechanic for 6 days and they were unable to locate the problem. They called me today and I was told that I have no compression in one of the cylinders (I have done business with them before and felt comfortable in that I wasn't being taken advantage of). Also, is there any problems in the future with getting a cylinder replaced i.e. other parts of the engine that might correlate?
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I have a 99 ford escort with a 2.0 SOHC engine and for the last week or so it was making a tapping noise but it was intermittent. Today, I revved the motor up slightly and it started making this horrible clanking noise and then it stalled out. I tried starting it up and when it did start to run, it made the same clanking noise then it shut off. I tried to start it up and it wont even turn over. Its acting like it seized up but I am not sure if its in the top end or the bottom end. Now I know the CVH engines are notorious for dropping valve seats but I am not sure how to diagnose it if that is what happened.
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I have a '98 F150 4X2 extended cab with a 4.2l with 233K on it. I have no problem with drivability when I drive 5 miles to work. However, a couple of weeks ago when I had to drive 15 miles to the liquor store to get what I needed (I live in a dry county) I got back into my truck, started it and drove of. It drove like crap like I lost a cylinder. Drove it back home those 15 miles, let it cool off, put my scanner on it and got a PO304 code and I think a PO174 (bank 2 lean) code. Went to the #4 cylinder and found the plug had loosened up.
Tightened it back up, cleared the codes, and went through my normal weekly routine of driving to work with no problem. Made a booze run the next weekend and the same thing happened. Limped back home and found another PO304 code. Found the plug to be tight and in good condition but changed all the plugs since they were cheap copper core and had 20K on them. The wires only have 20K on them, too. Installed platinum plugs, drove all week 5 miles to work and back just fine. Made another 15 mile run yesterday and the same crap happened all over again after I got out of the store and drove home.
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2009 Corolla 1.8 220K miles. Car has been pinging a lot recently. Codes set were P0300, P0301 and P0302 but no CEL??? Did all the test I know to do, problem isolated to cylinders #1 and #2. I did a compression check with disappointing results. Left to right left being the belt side: #1 60 PSI, #2 60 PSI, #3 125 PSI and #4 160 PSI. Throttle was wide open when I did the compression test and engine was hot. What happened????
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I just picked up my truck from my mechanic after he was trying to determine what was causing a misfire in cylinder 3. He swapped coils and then did a compression test and found the following results in cylinders 1 through 4, in order: 143, 132, 57, 151. He said I need to replace the engine or start with adding Engine Restore. Is there a chance I don't need to replace the engine? Could it need a valve job?
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I am a new vr6 owner. I just purchased mine not to long ago. It seems to have developed a pretty mean misfire on Cylinder #4. It is also showing a low compression level of 90 on cylinder #4. all my other cylinders show somewhere between 105-110. I replaced my wires and my coilpack. It did not improve anything, infact, my car seems to run worse now. I am baffled as to what can be causing my misfire.
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Got myself into a tight situation with a truck I recently purchased and seeing if any of you have experienced the same thing or know what may be going on. I bought a 1998 F-150 with 213,000 miles and a 4.2 engine. When I test drove the truck it had a small chugging vibration, for lack of a better term, but the check engine light was not on and it seemed to run great while driving. No problem at highway speeds nor below.
On my way home the check engine light turned on which turned into a blinking check engine light and I knew I had been taken by a person with a diagnostic computer who cleared the codes. He made a comment about it turning on before but his "buddy" fixed the issue but I took his word because he seemed like a decent person.
I took it to a local shop and, if I remember correctly, error code 302 came up for misfire on cylinder #2. He changed the plugs and wires and it seemed to run a lot better. About 5 miles later on my way home the check engine light turned back on, but it still seemed to run smoothly by the time I got home.
The next day I took it back to him and this time we got the same error code plus (again going of my poor memory) error 174 which he said was cylinder #2 running lean. Earlier today he called and said he checked over everything and couldn't figure out anything wrong until he checked the compression. He said the other 5 cylinders were around 130 psi and cylinder #2 was at 75 psi.
Now this mechanic runs more of a brake and exhaust shop so his next statements are why I'm coming to all of you for your opinions.
He said the cylinder was shot and everything inside was shot including the piston, rings, and everything else associated with #2. (I don't think he got in there to really check it out) After scouring the forums I hear more people talk about the valves may not be sealing correctly and what sound to me, to be smaller issues than the entire #2 cylinder being toast.
I'm not sure if I am going to go after the person who sold it to me or not yet but I would like to see what others may think is going on before I light this guy up. I plan on taking it to a more proficient mechanic to do the work, if deemed worthy of work, but would like to kmow where I stand.
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Anyways, poured in a whole damn bottle through the brake vacuum line. The engine sputtered a bit but never stalled. I saw almost no smoke after a whole bottle!! I thought with 156000 miles it would smoke like mad. I have taken very good care of this truck and changed oil every 3 to 5 with synthetic 5-20 since new. Could it be that clean???
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