Changed spark plugs, it was spitting and sputtering that did not stop it the exhaust is turning cherry red when running within 5 minutes,checked tailpipe to see if it was clogged and it is not. never been this puzzled before please help
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The two may not be related. The 505 code is for the IAC motor in the intake of the engine. Most often the cause of cherry red exhaust manifolds is unburned fuel getting into the exhaust and burning there. This can be due a a bad spark plug, plug, wire or coil causing misfires resulting in unburned fuel being ejected into the exhaust stream. It could also be due to a cracked or broken intake or exhaust valve. This would result in low compression in a cylinder, causing a misfire and having the same result.
Have the charging system checked for proper operation. If battery is not being charged properly and goes weak the electronic control modules within the vehicle will start shutting down and cause all sorts of drivability issues
It could be a bad coil. See which spark plug wires have spark when cranking the engine over, and which do not have spark. You have a coil pack with 3 ignition coils. So one coil supplies spark to two cylinders. You may find two cylinders not firing from one coil.
The cherry red is probably due to raw gasoline being burned in the converter. Since the engine isn't running right (and I'm surprised you didn't say the Check Engine light was on), there seems to be some kind of valve timing issue or perhaps a burnt valve that is causing at least one cylinder to not fire and thus expel the fuel/air mixture into the exhaust stream. This can be confirmed with a compression check of the cylinders. If they are all low, then there is a problem with valve timing, possible a jumped belt/chain. If only one cylinder is low, then a burnt or broken valve is more likely.
Check air cleaner. put some Lucas injector cleaner in the gas tank or a product called mystery oil. Also at night with all the lights off open the hood and watch to see if their is any sparking between spark plug wires.
If the pipe got cherry red while trying to start, it was because of unburnt fuel entering the catalytic converter, most likely. Check for signs of plug fouling and injectors hanging open. You're likely flooding your engine due to dirt accumulation in an injector.
When it's running poorly, how do the brakes feel? Is the pedal very hard? I know this sounds like a strange question, but I had a similar (but not exact same) problem which after completely testing everything three times and even swapping a pcm from a known good vehicle, I managed to fix,without replacing any parts but am not sure exactly what was wrong.(I believe I "outsmarted" the computer, but am still not sure what the underlying problem was) What I do suggest is that you individually test each sensor to see if anything is out of range. I'd especially look at the map sensor and throttle position sensor, possibly the cam sensor and sensor shaft.Stop buying parts and do the testing. Only then, after actually verifying a failure, should you replace any more parts!
I just had this fixed on my suby today. The cause is that the spark plugs, go through the valve covers on the 2.5 l .When the o rings in the cover go, the result is oil in the spark plugs. The cost of the repair in Canada was about $500 including diagnostics as well as new plugs and wires About 1.5 hours labor and new seals and gaskets. It now runs like new. This is a common problem for this subaru engine as well as for the dodge neon.