miss in number 7 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

baxie · 05-11-2004, 02:06 PM

i am new to this site and i am needing some help i just got back from Iraq about 2 weeks ago and my 1996 chevy truck with a 305 vortec has a miss in #7 i have had the check engine light coming on so i had it scaned i put new plugs, wires, cap and rotor on it i have 120 psi of compression in #7 the rest are about the same too the plug comes out with a lot of carbon built up on it it smothes out a little bit at a hirer rpm but on the low side it is very bad any help would be great

victoryauto · 09-29-2004, 04:26 AM

If it is a constant miss on number seven it is possibly the holograph in the distributor that is bad or crankshaft position sensor. If it only does it when it is cold, it is more than likely going to be the coolant temp. sensor in the front of the intake. Hope this may help you out.

Steveo_supremo · 09-29-2004, 09:41 PM

Also very possibly could be a bad injector. Best way to tell is have an injector balance test done at a dealership or qualified shop.

oldyeller · 09-30-2004, 09:32 PM

not to highjack your thread,

but I am having the same problem but on cyl 1 and 3. its very intermintant. have ruled out the ignition system, and think its the injectors, but what if it only does it when its warm? could it still be the temp sendor? and whats that injector balance test run $ wise?? oh, and is the holograph and crank sensor test-able??

victoryauto · 10-13-2004, 02:34 AM

That was a misprint on my part about the coolant temp sensor. If the engine runs bad AFTER warmup then the coolant temp sensor could be bad. Sorry about the misprint.

05-11-2004, 02:06 PM	#1
baxie Registered User Join Date: May 2004 Posts: 1	miss in number 7 i am new to this site and i am needing some help i just got back from Iraq about 2 weeks ago and my 1996 chevy truck with a 305 vortec has a miss in #7 i have had the check engine light coming on so i had it scaned i put new plugs, wires, cap and rotor on it i have 120 psi of compression in #7 the rest are about the same too the plug comes out with a lot of carbon built up on it it smothes out a little bit at a hirer rpm but on the low side it is very bad any help would be great

09-29-2004, 09:41 PM	#3
Steveo_supremo Registered User Join Date: Jun 2004 Location: Terrace, B.C. Canada Posts: 16	Also very possibly could be a bad injector. Best way to tell is have an injector balance test done at a dealership or qualified shop. __________________ 89 GMC K1500 ECSB, 94 Chevy C1500 ECSB

09-30-2004, 09:32 PM	#4
oldyeller Captain CAAAVVVMMMAAANNN! Join Date: Mar 2002 Location: Anna Texas Posts: 726	not to highjack your thread, but I am having the same problem but on cyl 1 and 3. its very intermintant. have ruled out the ignition system, and think its the injectors, but what if it only does it when its warm? could it still be the temp sendor? and whats that injector balance test run $ wise?? oh, and is the holograph and crank sensor test-able?? __________________ 72 LWB Fleetside C10 Custom 350/350 97 GMC Yukon 4X4 SLT Anna, Texas check out the project old yeller

09-29-2004, 04:26 AM	#2
victoryauto Registered User Join Date: Sep 2004 Location: natchitoches, louisiana Posts: 112	If it is a constant miss on number seven it is possibly the holograph in the distributor that is bad or crankshaft position sensor. If it only does it when it is cold, it is more than likely going to be the coolant temp. sensor in the front of the intake. Hope this may help you out.

10-13-2004, 02:34 AM	#5
victoryauto Registered User Join Date: Sep 2004 Location: natchitoches, louisiana Posts: 112	That was a misprint on my part about the coolant temp sensor. If the engine runs bad AFTER warmup then the coolant temp sensor could be bad. Sorry about the misprint.



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