Leaking injectors
02-13-02, 01:53 PM
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Leaking injectors
I know that my 91 NA is getting spark and I know that it's getting fuel, maybe too much. If I crank the engine for a bit and pull the plugs they are soaked with gasoline. My buddy said that that the plugs shouldn't be soaked and that the engine is probably flooding. That made sense so I checked the fuel pressure. The "running" pressure is about 39psi and the hold pressure was about 28 psi. If the injectors were leaking wouldn't the fuel pressure be low? If anybody has had problems with injectors please let me know how they diagnosed it. Is there any way other than pulling them and shipping them to RC?
On another note, I tried checking the compression with a piston compression checker and the test came up zero. Not 50 or even 5 but 0, the needle didn't move. Is that even possible? It makes me think there's a problem with the checker. I don't have the deep socket piece that screws on to the end. Would that make the test not work at all?
Let me know, thanks all. (Especially to Scott89t2 and fc3s.org, that manual was a godsend)
On another note, I tried checking the compression with a piston compression checker and the test came up zero. Not 50 or even 5 but 0, the needle didn't move. Is that even possible? It makes me think there's a problem with the checker. I don't have the deep socket piece that screws on to the end. Would that make the test not work at all?
Let me know, thanks all. (Especially to Scott89t2 and fc3s.org, that manual was a godsend)
02-13-02, 02:12 PM
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Does it run? i know it sounds daft but i heard a story about a guy who tryed to do a Compretion test on his Rx little did he know the plug was shorter than the Tester so he wound in the tester and turned his engine over and u guessed it got 0 psi but it made a very funny noise as it distroyed the tips.
Im not trying to scare you.
Ok you have proper flooded it take the fueses out turn it over for a few seconds to get rid of the Exess fuel then put the Fuses back in and usaly it should start.
The Compretion thing, it must be warm the fact its flooded aint going to help. so get it warm take out the trailing plugs, fit the Compretion tester (making sure it's not longer than the plug first) take off the Tps lead and just to be safe take out the fuses, then get a helper to sit in the car. When you turn it over hold the valve so it releases the presure every Stroke this tells you if you have a dodgy tip they should all be the same then while it still turning over release the valve and see what it maxes to should be over 100 (i'm a Turbo man so u'll have to look it up).
Ok hope this helps.
Im not trying to scare you.
Ok you have proper flooded it take the fueses out turn it over for a few seconds to get rid of the Exess fuel then put the Fuses back in and usaly it should start.
The Compretion thing, it must be warm the fact its flooded aint going to help. so get it warm take out the trailing plugs, fit the Compretion tester (making sure it's not longer than the plug first) take off the Tps lead and just to be safe take out the fuses, then get a helper to sit in the car. When you turn it over hold the valve so it releases the presure every Stroke this tells you if you have a dodgy tip they should all be the same then while it still turning over release the valve and see what it maxes to should be over 100 (i'm a Turbo man so u'll have to look it up).
Ok hope this helps.
02-13-02, 04:47 PM
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As for the injectors i have been asking around and i may be wrong but i belive the injectors can leak in too ways Internaly and Externaly.
Extenaly leaking Injectors basicly leak fuel all over the side of the engine.
Internaly means they dont close properly and leak into the inlet manifold, i am still trying to find out some more information on it but i belive they can cause it to flood when when you turn it off and leave it for a period of time, the presurised fuel leaks out of the Fuel rail into the Inlet. To cure it you can ither fit a fuel cut off (the cheep way) or take it apart and get them cleaned.
I belive you can check them by runing the car, remove the fuel pump fues, then run it out of fuel, then turn the ignition off and replace the fues. leave it over night and see if it starts alot easyer next morning.
Extenaly leaking Injectors basicly leak fuel all over the side of the engine.
Internaly means they dont close properly and leak into the inlet manifold, i am still trying to find out some more information on it but i belive they can cause it to flood when when you turn it off and leave it for a period of time, the presurised fuel leaks out of the Fuel rail into the Inlet. To cure it you can ither fit a fuel cut off (the cheep way) or take it apart and get them cleaned.
I belive you can check them by runing the car, remove the fuel pump fues, then run it out of fuel, then turn the ignition off and replace the fues. leave it over night and see if it starts alot easyer next morning.
02-13-02, 05:35 PM
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A flooded engine WILL resigester 0 compresion... especially if it is a little worn....
The rotary won't unflood itself..
I am guessing your engine is fine, it's just flooded.
take the plugs out, and pull the EGI fuse under the hood.
crank the engine for 10 seconds or so... then squirt a bit of heavy (or regular if its all you have) motor oil in the plug holes, and crank it for another ten seconds. Dry the plugs completely, and put them back in.
try cranking the engine with the plugs back in, but with the EGI fuse still out... it should crank a LOT slower, a good sign. put the fuse back in, and crank it, it should start-
If not, get a push start!! I had to be towed at 40 km/hr in an 88 gxl, because the car would flood... and I didn't know about this special process!!
You shouldn't always have to pull the plugs.... usually just the egi fuse needs to come out, crank it, put it back in, and it should start on the next crank attempt.
Good luck... Might want to get some injector cleaner too.
The rotary won't unflood itself..
I am guessing your engine is fine, it's just flooded.
take the plugs out, and pull the EGI fuse under the hood.
crank the engine for 10 seconds or so... then squirt a bit of heavy (or regular if its all you have) motor oil in the plug holes, and crank it for another ten seconds. Dry the plugs completely, and put them back in.
try cranking the engine with the plugs back in, but with the EGI fuse still out... it should crank a LOT slower, a good sign. put the fuse back in, and crank it, it should start-
If not, get a push start!! I had to be towed at 40 km/hr in an 88 gxl, because the car would flood... and I didn't know about this special process!!
You shouldn't always have to pull the plugs.... usually just the egi fuse needs to come out, crank it, put it back in, and it should start on the next crank attempt.
Good luck... Might want to get some injector cleaner too.
02-14-02, 04:32 PM
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On start up the Engine needs oil to produce a good seal, when the car floods it washes the oil from the bore thus reducing the seal and making the compretion very low. This is why the engine spins quicker when flooded as there is less compretion.
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