Head gasket
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The compression test was done incorrectly, then. If all 4 cylinders held a consistent-but-low pressure then your engine shows signs of uniform wear (such as unimaginably high miles or you have been running no air filter for a long time, ect...) or the test was faulty. It would be extremely rare that a head gasket failed around all four cylinders at the same time.
Hi I ll start from beginning started with small amount of coolant loss which cudnt find no crust on oil cap coolant looks and smells fine no over heating small amount of white smoke til it warms up then clears fan kicks in no problem obv wanted to get car compression tested which I witnessed from the inside of my car this is how he done it he took sparks out disconnected coil he put his tester on each 1 as I cranked car for bout 10 secs on each cylinder each 1 read 90 but I no nothing about cars so need advice on what to do many thanks
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21,250 Posts
90 psi is low, but it could be a sign of a bad compression tester as well. If engines have bad compression they don't usually run. I'd be leary of this being an indicator even if it was my compression tester.
What is the mileage on the engine? When was the last time the timing belt was done? When you experience your misfire- is the check engine light flashing?
The symptom you're describing- misfire, or generally not running good- could be a sign of several problems. I would start with the most cheapest fix or check first before jumping to something extremely expensive like a head gasket. Furthermore, what if your problem was merely worn spark plugs, and you spent 1000 quid on an unnecessary repair that also included new spark plugs which fixed the problem. Dive into the usual suspects first: spark plugs, spark plug wires, fuel filter, clean the MAF, clean the PCV valve, clean the IAC, change the air filter, and see what happens after you've done all this which anyone should be able to do without much knowledge and a service manual.
If the compression test results are disheartening, then get it checked somewhere else to see if they come up with a higher number.
What is the mileage on the engine? When was the last time the timing belt was done? When you experience your misfire- is the check engine light flashing?
The symptom you're describing- misfire, or generally not running good- could be a sign of several problems. I would start with the most cheapest fix or check first before jumping to something extremely expensive like a head gasket. Furthermore, what if your problem was merely worn spark plugs, and you spent 1000 quid on an unnecessary repair that also included new spark plugs which fixed the problem. Dive into the usual suspects first: spark plugs, spark plug wires, fuel filter, clean the MAF, clean the PCV valve, clean the IAC, change the air filter, and see what happens after you've done all this which anyone should be able to do without much knowledge and a service manual.
If the compression test results are disheartening, then get it checked somewhere else to see if they come up with a higher number.
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The O2 sensor determines the air to fuel ratio, if that isn't reading right then the car will run bad when the computer tries to adjust it while running. I recommend the NTK sensors off of Rockauto.com. They are the makers of the O2 sensors for Ford and is identical to the Ford sensor just cheaper.
These cars have so many water hoses they are well known for losing small amounts of coolant and can be hard to find the cause. You have to look at every single possible leak point, the water pump can lose small amounts that get spun out of the belt so you can't find that either. Only when the leak gets worse will it maybe drip where you can find it. Heater hose attachments at bottom of firewall and the lower small hose below thermostat can leak and you not find it.
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