Question about 1999 GMC Jimmy
Rough idle and stall. Distributor, spark plugs, rotor and wires all replaced, did not help.
These trucks have a spider injector and all depending on the year it may have one central injector or 6 and then popets, these are lines that run to each injector, you will need to make sure the fuel pressure is good, low pressure will cause problems i think it is 62 psi key on engine off, and the other problem is the fuel lines going into the rear of the intake to feed the injector leak inside and cause rough idle and misfire, this is for the older one. the newwer trucks have the fuel lines external and you will see them on the top of the injector housing.
A good way to tell if the line is leaking , o and also the fuel regulator inside the plenium also leaks causing the same type of problem, to test you will need a fuel pressure gauge , hook it up ,turn key on and pressure will go up then turn key off and if pressure drops then you have a leak, could be fuel pump check valve but may be line or regulator, if you remove the throttle body and with a pen light look inside intake for leakage.or remove upper intake and do the same thing, better view this way.
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
do u hav the wires on the rite plugs-crosses are common--are plugs gapped rite--get a haynes manual for problems--dirty idle valve questionable
Posted on Dec 15, 2010
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