Dead miss in a Vortec - Pirate4x4.Com : 4x4 and Off-Road Forum

Degnol · 11-14-2005, 11:53 AM

'98 Vortec 110K, tuneup at 90K, rotor, cap wires and those spendy GM plugs.
2K later check engine light comes on, code says miss in cyl #4, diagnosed as bad wires, replaced. 2K later, misfire in #4, diagnosed as bad plug, 10K lare same deal. Last week I can feel a miss and the light comes on, miss in #4, diagnosed as a cracked plug, today same dead miss. WTF????
Somebody said a bad injector can cause this? Anyone point me in the right direction, I'm GM stupid. I'm visiting from the Landcruiser forum FJ40.

Thanks,
Ed

3/4ton62gmc · 11-14-2005, 08:22 PM

These Vortec motors are natorious for this problem. GM even has a updated part for the injectors because they had so many problems. As for a bad plug several times i dont think the injector causes this, Im guessing you are checking for damage in the area of the electrode. Also if you can still hook up gm scan tool you can do an injector balance check and find out if the injector is ok. I have never had the problems with the spark plugs but i have put atleast 100 injectors in. You can replace and injector with a new part but old designe for about a 100$ or use the new updated part for about 500$. My .02$

11-14-2005, 11:53 AM	#1 (permalink)
Degnol Registered User Join Date: Feb 2003 Member # 17146 Location: Kansastitty Posts: 208	Dead miss in a Vortec '98 Vortec 110K, tuneup at 90K, rotor, cap wires and those spendy GM plugs. 2K later check engine light comes on, code says miss in cyl #4, diagnosed as bad wires, replaced. 2K later, misfire in #4, diagnosed as bad plug, 10K lare same deal. Last week I can feel a miss and the light comes on, miss in #4, diagnosed as a cracked plug, today same dead miss. WTF???? Somebody said a bad injector can cause this? Anyone point me in the right direction, I'm GM stupid. I'm visiting from the Landcruiser forum FJ40. Thanks, Ed __________________ [FONT=Tahoma][/FONT][COLOR=DarkGreen][/COLOR][FONT=Times New Roman][/FONT]"Get a haircut and get a [I]real[/I] job" '66?FJ40 3.5" lift,4WDB, Corvette Master, MiniPS, '74 F and a fresh 2F on the way TLCA #14529

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11-14-2005, 08:22 PM	#2 (permalink)
3/4ton62gmc Wheeler Join Date: Nov 2004 Member # 38880 Location: Phoenix Az. Posts: 245	These Vortec motors are natorious for this problem. GM even has a updated part for the injectors because they had so many problems. As for a bad plug several times i dont think the injector causes this, Im guessing you are checking for damage in the area of the electrode. Also if you can still hook up gm scan tool you can do an injector balance check and find out if the injector is ok. I have never had the problems with the spark plugs but i have put atleast 100 injectors in. You can replace and injector with a new part but old designe for about a 100$ or use the new updated part for about 500$. My .02$