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> Only firing on 2 cylinders, Same side so its not cam
JB 914
post Nov 21 2004, 03:21 PM
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Fired up the car today and it was running really rough. Skline came over and pulled the wires off 1 and 2 and there was no change. Its got hydraulic lifters, could it be they are all collapsed on the one side? It gets gas, and its got spark. I guess the next step would be compression check and pull the vavle cover to see if they are functioning? Any ideas???
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DrifterJay
post Nov 21 2004, 03:25 PM
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damn...your engine is bad too....... <_<
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DrifterJay
post Nov 21 2004, 03:26 PM
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at least you got the chevy though...
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jimtab
post Nov 21 2004, 03:51 PM
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This may sound stupid but pull the valve cover off of the side that's not firing. A VW bug I used to have had exactly the same symptoms and the cause was the bolts had sheared and the rockers were laying in the valve cover, extracted the bolts and re did the job...all better.
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Series9
post Nov 21 2004, 04:13 PM
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1. Check compression on all cylinders.

2. Use a timing light to verify spark on all cylinders.

3. Check the timing.

Your problem will probably reveal itself in one of these steps.
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Aaron Cox
post Nov 21 2004, 05:02 PM
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that sucks.....

bummer....was just at joe sharps house, hope it sorts out (IMG:style_emoticons/default/smile.gif)
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LvSteveH
post Nov 21 2004, 05:22 PM
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If you are running carbs, check the idle jets, they get plugged easily, and can render the cylinder dead until the main jets come on at 3000 rpm, and even then it might be a bit lean without the extra fuel.
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skline
post Nov 21 2004, 06:38 PM
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I would pull the valve cover off that side and fire it up and make sure your valves are opening. It was working fine before you pulled that cover off earlier, I would bet the whole story will become clear with the cover off. If you were not having that party today, I would have helped you and we could have figured it out in no time. If you do get to it today, let me know what you find? I am still betting either lifters not pumped up or the valve train is not hooked up right. The push rods may be laying in there not even hooked up.
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JB 914
post Nov 21 2004, 07:13 PM
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QUOTE(skline @ Nov 21 2004, 04:38 PM)
I would pull the valve cover off that side and fire it up and make sure your valves are opening. It was working fine before you pulled that cover off earlier, I would bet the whole story will become clear with the cover off. If you were not having that party today, I would have helped you and we could have figured it out in no time. If you do get to it today, let me know what you find? I am still betting either lifters not pumped up or the valve train is not hooked up right. The push rods may be laying in there not even hooked up.

i popped off the valve cover and it doesn't appear the valves are moving as much as you said they should Scott. i left it off, so, maybe you can stop by on Monday and take a look.

I'm guessing it's the lifters. Anyone got some hydraulic lifters they wanna sell?
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Demick
post Nov 21 2004, 08:28 PM
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Could be a dropped intake valve seat. Mine exhibited similar simptoms when that happened. If the intake valve seat drops and holds the valve open, then it can affect all of the other cylinders in a very wierd way. I could pull both plug wires from one side of the engine, and both fuel injector wires from the other side of the engine, and it still ran as crappy as when they were all plugged in. Hope it's not that, but a compression test will immediately tell you.

Demick
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Dave_Darling
post Nov 21 2004, 08:36 PM
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Check all of the wires in the engine bay first. Injector plugs, injector ground wires, and so on. That is probably the easiest way to lose 2 cylinders.

--DD
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qa1142
post Nov 21 2004, 09:01 PM
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If you are running stock FI the grounds run in pairs side to side. You likely have bank one ground NFG.

Check it.

(Learned this from Brad Mayuer!)
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ChrisReale
post Nov 21 2004, 09:28 PM
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QUOTE(joe buckle @ Nov 21 2004, 05:13 PM)
Anyone got some hydraulic lifters they wanna sell?

Ask Jake Raby! (IMG:style_emoticons/default/laugh.gif) Sorry couldn't resist
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qa1142
post Nov 21 2004, 09:45 PM
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Check your grounds
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JB 914
post Nov 21 2004, 10:06 PM
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running carbs and they are getting fuel
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Dave_Darling
post Nov 21 2004, 10:10 PM
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Then they're not getting something else, I bet....

You can check to see if they're getting spark by taking a spare plug and taping it so the threaded area (or outer electrode) is against a ground. Then you can watch the plug while someone cranks the starter.

BTW, major compression losses will show up as an uneven pattern in the sound of the starter motor. I found my last dropped valve seat by noticing that the starter went "RR-RR-RR-..-RR-RR-RR-.."

--DD
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Aaron Cox
post Nov 21 2004, 10:13 PM
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(IMG:style_emoticons/default/agree.gif) check for spark on those two cyls...

then compare that rockers motion with the other like one (exh or intake) on the other side
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JB 914
post Nov 21 2004, 10:17 PM
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QUOTE(Aaron Cox @ Nov 21 2004, 08:13 PM)
(IMG:style_emoticons/default/agree.gif) check for spark on those two cyls...

then compare that rockers motion with the other like one (exh or intake) on the other side

gonna try that monday if i get time before sundown got dark, so, i closed shop. Cold too!!
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JB 914
post Nov 21 2004, 10:19 PM
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QUOTE(joe buckle @ Nov 21 2004, 08:17 PM)
QUOTE(Aaron Cox @ Nov 21 2004, 08:13 PM)
(IMG:style_emoticons/default/agree.gif)  check for spark on those two cyls...

then compare that rockers motion with the other like one (exh or intake) on the other side

gonna try that monday if i get time before sundown got dark, so, i closed shop. Cold too!!

BTW, got plenty of spark and gas new plug wires, new points, new pulgs
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Aaron Cox
post Nov 21 2004, 10:45 PM
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ok..so its strictly mechanical then.... cam - lifter - pushrod - rocker - valve - valve seat pick your poison
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