97 tahoe

[mossyoakman827]

i baught this tahoe last yr and it had a misfire on cylnder number one so i started work. i went ahead and put a brand new distributer in along with new cap button and wires. still the same misfire so i put injectors in and bam problem fixed up until about two months ago same thing so i did everything agin and it did not fix my problem. so i put brand new heads on it still the same problem also new sensors. i had truck up on rack one converter is gutted out the other isnt could this be my problem? please help any suggestions anything i want to put a bigger lift and shave and paint but not till this problem is fixed its driving me nuts

 

[TIM Z]

Any check engine codes?

If so please list.

Have you checked your fuel pressure ??

Clean fuel filter??

 

[mossyoakman827]

re.

yes did a compression check i had 180 on cylnders 2-8 and 190 on cylnder 1?
fuel pressure was good and the filiter is new its a wix brand

 

[destroyer1362]

check the bleed down on the fuel rail may be the fuel pressure regulator if you haven't replaced that yet.

 

[mossyoakman827]

the bleed down is ok and a new regulator comes with the spider injectors?

---------- Post added at 11:40 PM ---------- Previous post was at 11:38 PM ----------

i ran a code scout on it today all it says is cylnder one misfire detected

 

[kjlegend]

Plugs and wires???? I had the same problems on my truck did basically the same things as you. After replacing the spider injectors the plug was so fouled out I had to clean them up a bit, this helped dramatically.

Otherwise check your sensors; crankshaft positioning sensor, cam sensor, and a few others I cant think of off the top of my head..

 

[mossyoakman827]

its got brand new plugs wires and all sensors i am lost

 

[kjlegend]

Check the spark plus gaps, and make sure they all look the same. Sometimes if its misfiring like that it will foul out the plug.

Also if they are cheap wires I had one "brand new" wire that was faulty. I replaced it and it helped a lot.

 

[mossyoakman827]

i put brand new delco wires and delco plugs today pre gap but i checked them any way still the same mis

 

[blueflamed03]

so one side, the cats are gutted, and the other side is still stock? The 02 sensors could be reading, and mis-sending incorrect data to the computer..

 

[mossyoakman827]

thats kinda the way i was leaned just wanted to see what other people thought thanks im getting a full exaust ill let yall know again thanks

 

[branndon_b]

stupid question, does the service engine light go away if the conditions clear? or the code, does the code clear on its own? i know some cars you have to clear out the old codes, they may not go away on their own. you may be doing that already, was just asking a possibly stupid question. branndon.

 

[destroyer1362]

stupid question, does the service engine light go away if the conditions clear? or the code, does the code clear on its own? i know some cars you have to clear out the old codes, they may not go away on their own. you may be doing that already, was just asking a possibly stupid question. branndon.

on mine the light comes and goes but I'm 99% sure the code stays until you clear it

 

[mossyoakman827]

on mine the light comes on and blinks when the truck has a misfire i know the code canbe cleared and if not fixed will come back on but i think the other is based on drive cycles after the computer finds nothing wrong after so many cycles it will clear sometimes store in the computers memory even when fixed and cleared

 

[destroyer1362]

Someone correct me if I'm wrong but doesn't the blinking light mean something more urgent than a misfire, like running lean or something?

 

[kjlegend]

Yes, If your light is BLINKING vs SOLID ON then you have a major malfunction. As my mechanic says "A catastrophic malfunction and stop the mother fu$%in car now"

 

[stykthyn]

Yes, If your light is BLINKING vs SOLID ON then you have a major malfunction. As my mechanic says "A catastrophic malfunction and stop the mother fu$%in car now"

+1 blinking light means bent pushrods, stuck lifters, possible PTV clearance. It's ugly.

 

[gd2227]

a slight misfire and a blinking check engine light on mine = 1 bent push rod in the shape of a Z, 1 pushrod sent through the top of the rocker, 5 roller lifters with blown out retaining rings (with a bunch of small metal fragments send all over the cam galley and down into the pan). I believe the #4 piston is dead as well.
SO, +2 for the blinking check engine light = bad

 

[mossyoakman827]

didnt know that ill call the dealer monday and find out ill be sure and let youkno thanks

 

[mossyoakman827]

dealer says a blinking check engine light means that is when the engine is misfireing, yes a bent push rod can cause this I agree but wouldnt i hear it knocking?