P0305 code but has spark and 150# compression
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
P0305 code but has spark and 150# compression
I’ve got a ranger I acquired from my brother that he lost the key for and gave me the truck. I got a new key programmed for it. Wouldn’t start. I put a new fuel pump on it and it fired right up but ran rough. It also had a really bad oil leak. So I decided to pull valve covers, intake, and put new injectors and plugs in it. Got it all back together and fired up and still has the miss. So far I’ve done a compression test, all cylinders 150. Moved spark plug from #5 hole to #6 hole no change. Cranked vehicle with plug removed and plug in wire and has good spark. But every time I pull plug it is wet. Does this sound like a bad injector? They are a pain to get to. Maybe I can swap injectors. But what really has me thinking it is something else is that same cylinder had the worst looking plug when I originally tore it apart. Truck has around 145k on it.
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Joined: Jan 2004
Posts: 13,851
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From: SW Va
Might be helpful to know which year & engine this puppy is & what the old plug was wet with, oil, fuel, coolant???
If you suspect its fuel, maybe hook up a pressure gauge & see how fast pressure is dropping. If its the new #5 injector thats suspect maybe pull it & have the store pressure test that puppy to see if it has a runny nose. Some beginning thoughts for consideration, let us know what you find.
If you suspect its fuel, maybe hook up a pressure gauge & see how fast pressure is dropping. If its the new #5 injector thats suspect maybe pull it & have the store pressure test that puppy to see if it has a runny nose. Some beginning thoughts for consideration, let us know what you find.
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Well I think I found my culprit, I tested that cylinder again after running the truck with the spark plug removed and only got 130# of compression. So I took the compression tester tool and removed the gauge and began to blow air into the cylinder and it had blow by so much that putting a bag on the oil filler cap it would move the bag. Also my best guess for this scenario was that when I had done the compression test the first time it was after I had driven the truck and parked it and checked it cold the next day and maybe after fouling the plug the cylinder was wet enough it gave that 150psi reading. Cause tonight it did almost that except the first crank not as high. But I re checked it about 3 times and it would get a little lower each time. But the 130 was the lowest.
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mikekerr
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Nov 21, 2019 04:17 AM
