February 28, 200917 yr 97 OBS 210k EJ22 5MT the cel comes on when the tank is down to a 1/4 or less. code is P0440 for evap system. the car had a replacement fuel cap, i replaced it with a known good oem one from a 93 imp and it comes on less, but still comes on...could there be a tiny leak somewhere and how would i find it?
February 28, 200917 yr The purge control valve and solenoid are under the intake right rear. The smallest dia. rubber line from the fuel rail goes to one of these. Look for leaks between the hose off the fuel rail and the purge canistor in the front right of the engine compartment, unless the canistor is in the back near the gas tank on your car. This includes the valves and solenoid. There should be a hood sticker showing the vacuam hose routing for the purge control system. If you have a hand held vacaum tool use that to create a vac and find the leak.
March 1, 200917 yr The filler necks rust out often and cause a leak and P0440. This is what my most often problem is for this code. Easy to spot. Next time after pumping gas crawl underneath. If the plastic is still in place that's a bad sign - probably hasn't been replaced yet.
March 1, 200917 yr Author i looked up the code and found this: http://www.obd-codes.com/p0440 i've checked the purge solenoid and it's a rust free ca car so i really doubt the fill neck is cancerous but i'll take a peek. i've been meaning to throw another evap can in it to see what happens but 97's have the bulky canister under the rear and i only have the little round ones on the shelf. no time to make one work... i'm mostly interested in if there's an easy, reliable way to detect leaks - especially in rubber hoses. and safe i should say... also, i should say i replaced the original engine with a 95 longblock and to my knowledge there was no cel before. i was really careful with the manifold but i still suspect a tiny leak in there somewhere. i'd just like to know before i spend the time/$ replacing all those hoses... Edited March 1, 200917 yr by mountaingoatgruff
March 1, 200917 yr i looked up the code and found this: http://www.obd-codes.com/p0440 i've checked the purge solenoid and it's a rust free ca car so i really doubt the fill neck is cancerous but i'll take a peek. i've been meaning to throw another evap can in it to see what happens but 97's have the bulky canister under the rear and i only have the little round ones on the shelf. no time to make one work... i'm mostly interested in if there's an easy, reliable way to detect leaks - especially in rubber hoses. and safe i should say... also, i should say i replaced the original engine with a 95 longblock and to my knowledge there was no cel before. i was really careful with the manifold but i still suspect a tiny leak in there somewhere. i'd just like to know before i spend the time/$ replacing all those hoses... Not something people will have at home but there are machines that pump smoke into the fuel tank and you just look for the leak that way. If you have a compressor with a regulator that goes down fairly low, you could make up some fittings to pressurize the evap system with a few psi and listen/feel for leaks. I made a setup like that for the turbo subies to pressurize the turbo plumbing to look for leaks.
March 1, 200917 yr Author thank you. i'll have to spend some time looking after i get some more tools unpacked from my recent move.
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