my 91 sl2 is dumping fuel into cly. 1 tane going into the exhaust does and the injectors are new and the pcm is new to does any one know what could be the plb.

sure its fuel? i assume you are checking by reading the spark plug. you may want to swap the injectior with another cylinder and see if the problem follows, if it doesn't try swaping the injectior connectiors. any missfire or SES light? checked all fluid levels? preformed a compression or CLD test?

sure its fuel? i assume you are checking by reading the spark plug. you may want to swap the injectior with another cylinder and see if the problem follows, if it doesn't try swaping the injectior connectiors. any missfire or SES light? checked all fluid levels? preformed a compression or CLD test?

it is fuel so sure there is no ses light on i allredy did swaping the injectior connectiors and nothing haping????

Stuck valve?

Stuck valve?

new i just got the motor re-built

try swaping the injectior it self with another cylinder.

try swaping the injectior it self with another cylinder.

did that and got a new injectior but it is still dumping fuel into cly. 1 any other thing i sould do im thiking it is the wire to the injectoir that gos to the pcm?

its possible, but with any luck swaping the connectiors would rule that out, but if you want to see, as a quick test you could get 2 NOID lights, put one on cyl 1, put the other on a known good cylinder, and crank the engine, they should appear the same or at least simular. any other testing requires a digital multimeter and/or a osilioscope. a test light or a analog multimeter may damage the PCM.

its possible, but with any luck swaping the connectiors would rule that out, but if you want to see, as a quick test you could get 2 NOID lights, put one on cyl 1, put the other on a known good cylinder, and crank the engine, they should appear the same or at least simular. any other testing requires a digital multimeter and/or a osilioscope. a test light or a analog multimeter may damage the PCM.

we did swaping the connectior nothing haping and we did try other pcm and nothing my friends is thiking the wire it hit gorund and keeping the injeacter open so he is going re wire the injacter 1 any other things?

we did swaping the connectior nothing haping and we did try other pcm and nothing my friends is thiking the wire it hit gorund and keeping the injeacter open so he is going re wire the injacter 1 any other things?

its still doing it with the new wire do u know any other thing i could try

if its not the injectior itself, and its not the electrical system, the only other places fuel can get in to the engine would be a leaking fuel pressure regular diaphram or a saturated carcoal cansiter, but both of those would effect all cylinders, except after shutdown, then if anything #4 would get filled up.

or the problem is not fuel, its something else(you never did say how you confirmed excess fuel was the problem)

if its not the injectior itself, and its not the electrical system, the only other places fuel can get in to the engine would be a leaking fuel pressure regular diaphram or a saturated carcoal cansiter, but both of those would effect all cylinders, except after shutdown, then if anything #4 would get filled up.

or the problem is not fuel, its something else(you never did say how you confirmed excess fuel was the problem)

it is the fuel bes. t is blowing black somke and wane u take out the plug in cyl. 1 it is droping fuel

i personially would look into fuel pressure(system running and residual pressure), vaccum test the fuel pressure regulator, ensure you have a strong spark, and do a compression and cylinder leak down test.

i personially would look into fuel pressure(system running and residual pressure), vaccum test the fuel pressure regulator, ensure you have a strong spark, and do a compression and cylinder leak down test.

the funny thing is its runs fine intill u put it in drive and drive it for like 15 mins tane it wants to still and thats wane it starts dupming gas

ah, now thats telling me something, it only happens when warm? disconnect the connectior to the O2 sensor and see what happens, this will force the computer to stay in open loop(fuel system acts differently without a O2 sensor). also, use a ohmmeter to test injectior resistance cold and hot.(resistance should not change significently) have you ever replaced the ECT? (its a known troublesome part on saturns, it will affect the A/F ratio, but i have not seen one before cause black smoke)

ah, now thats telling me something, it only happens when warm? disconnect the connectior to the O2 sensor and see what happens, this will force the computer to stay in open loop(fuel system acts differently without a O2 sensor). also, use a ohmmeter to test injectior resistance cold and hot.(resistance should not change significently) have you ever replaced the ECT? (its a known troublesome part on saturns, it will affect the A/F ratio, but i have not seen one before cause black smoke)


to come to found out the my friend found out it was the injectior's from pep boys so we put deler injectiors on and it run very good