Its hard to start. once running, and hot, it runs and idles ok but smokes (blue) heavily. Checked the fuel pump - good, checked fuel at the injectors - good. I unplugged 1 of the injector connections and.....nothing changed. Unplugged the other, it died.
A code 51 is an injector code. It could be a broken wire at the injector (typically very hard to diagnose because they break right at the injector body)......but more than likely it is indicating a broken wire to the TPS. Check the TPS wires very closely for signs of cuts or bare spots. I'd rule out the TPS before moving onto the injector.
It could also indicate a weak fuel pump (unfortunately a very common problem). Check the fuel pressure. It should manitain 39 psi throughout the RPM tange.....including under a load and when hot, so be sure to test it with the machine thoroughly warmed up.
SOURCE: 95 Chevy Blazer 4.3 white smoke at idle
my 1988 chevy blazer 4x4 smokes on cold starts till it warms up then it goes away what is causing it
SOURCE: will not start after it stalls untill about 5-10 minutes
Your problem is most likey your intake gasket.They have a problems on the SOHC engines where the intake gasket shifts & starts leaking vacuum at the #1 intake runner causing a missfire on Cylinder #1.While the engine is Idling buy some throttle plate cleaner & spray throttle cleaner down at the #1 Intake runner where the intake meets the head.If engine stalls or runs rougher that's your problem.I have replaced dozens of those gaskets for tha reason!! They have a beter design gasket through saturn parts.It has a coating on it to prevent reoccurance.Also you should check you Coolant Temp Sensor,if it's ceramic it's most likely bad.Replacement is brass from saturn.Good Luck
SOURCE: Rough idle and generally running terrible!
if idling rough sound like air in system.and your injection pump timing is off.
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
43 views
Usually answered in minutes!
×