#2 cylinder misfire
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#2 cylinder misfire - 11/2/2007 6:55:16 PM
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megtom2
Posts: 55
Joined: 7/11/2007
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I changed out the cpi today on my 1995 blazer and while waiting for the cpi I replaced the dist. cap and rotor. Well, tonight when I got everything put back together and cranked it up I got the code for #2 cylinder misfire. It is running rough. Hey, the lope is gone but is is running awful needless to say. Should I focus my attention to the dist cap and wires or could the cpi replacement be causing the crappy running of the engine? Thanks
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RE: #2 cylinder misfire - 11/2/2007 6:58:06 PM
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swartlkk
Posts: 15286
Joined: 5/1/2005
From: Waterloo, NY
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Did you verify that there were no fuel leaks after replacing the CPI unit? Did you replace the internal fuel lines at the same time you installed the CPI? If not, you could have a leak in the internal lines. The 'nut kit' as it is commonly referred to really is a single use item. Once it is disassembled, it should be replaced.
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RE: #2 cylinder misfire - 11/2/2007 7:11:31 PM
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megtom2
Posts: 55
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Changed out the nut kit along with the cpi. How would I check any farther than looking at connections? I powered it up before I battoned down the plenum to make sure nothing was leaking inside the manifold.
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RE: #2 cylinder misfire - 11/2/2007 7:26:42 PM
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swartlkk
Posts: 15286
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From: Waterloo, NY
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Ok, so check that off the list.
Next I would go through and check all of the spark plug wires. Pay special attention to where they each connect to the distributor cap as air can be trapped when pushing the wire onto the terminal. I use a small screwdriver to release the air when installing the wires onto the distributor cap. This will keep things nice and tight.
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RE: #2 cylinder misfire - 11/2/2007 8:14:05 PM
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megtom2
Posts: 55
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I'll try again tomorrow. When I changed the wires before this it didn't screw up anything. Could the dist cap or rotor be off somehow and make it throw the cylinder 2 misfire? I have an extra plenum gasket so I may very well take off the top tomorrow and make sure all the poppets are in like they are supposed to be. Thanks man.
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RE: #2 cylinder misfire - 11/2/2007 9:04:29 PM
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megtom2
Posts: 55
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I went ahead and checked all of the wires tonight. Still missing #2. Damn, I was so ready to hear a nice purr instead of the awful noise it is making.
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RE: #2 cylinder misfire - 11/3/2007 6:12:06 AM
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megtom2
Posts: 55
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OK, it is slowly warming up here and trying to come up with a plan of attack. Should I first try taking off the dist cap and rotor and checking them out and then reinstalling them? That should be fun with the upper intake back on now. Just trying to figure out what has screwed up. Damn!
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RE: #2 cylinder misfire - 11/3/2007 9:37:02 AM
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megtom2
Posts: 55
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Ok, just took the upper plenum off again. Ummm,,,, small puddles of gas now. Smells awful. Did Lindertech or whatever send me a shot cpi??
Lines are not leaking. I hooked up the battery and turned the key for the pump to cycle and it isn't leaking then. WTF is going on here?
I already know the answer but I can't crank it with the top off to see where...... sorry, I'll sit and wait for advice.
< Message edited by megtom2 -- 11/3/2007 9:39:02 AM >
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RE: #2 cylinder misfire - 11/3/2007 1:06:32 PM
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megtom2
Posts: 55
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No ideas?
I have taken off the cap and rotor and reinstalled them to make sure they are not the problem. Could moving around everything during the install mess up my control module?
I have done a fuel pressure test with it turned off. It has good pressure when turning the key but it drops thereafter. Not sure where the leak is since I can't detect any fuel leaking from the nut kit. Alldata tells me the injector is bad if it doesn't hold pressure and no leak detected. Any Help?
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RE: #2 cylinder misfire - 11/3/2007 2:46:39 PM
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megtom2
Posts: 55
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Bolted everything back up after checking and rechecking everything. Cranked it up. #2 cylinder misfire once again. Is this a bad cpi or should I take back the cap and rotor since they were Auto Zone specials and see if that is the problem?
Is there anybody here today?
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RE: #2 cylinder misfire - 11/3/2007 4:35:13 PM
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blazeofglory
Posts: 50
Joined: 9/30/2007
From: Navarre Fl
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Tom,
Have you tried clearing the code(s) once you completed the repairs. Sometimes it works,.....sometimes it doesn't. Worth a shot, best of all it's cheap and easy.
Keep us posted
Gator
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2001 s-10 Blazer LS 4.3 5 spd 2wd
2004 Kawasaki ZRX1200
1986 K-5 Blazer 4x4 420ci 700r4 4in lift 33's
1979 c-35 1 ton dually 505 4L80E
1971 ElCamino SS 496 6 spd 4.56 posi
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RE: #2 cylinder misfire - 11/3/2007 6:12:01 PM
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megtom2
Posts: 55
Joined: 7/11/2007
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Codes cleared. I think Lindertech sent me a crappy injector.
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RE: #2 cylinder misfire - 11/3/2007 7:15:08 PM
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blazeofglory
Posts: 50
Joined: 9/30/2007
From: Navarre Fl
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Tom,
You have a CPI correct? (one injector, six poppet valves?) If so then a bad injector would effect all six cylinders, but a bad poppet valve might only effect one. You stated you smelled fuel, and that you have a fuel pressure drop? It almost sounds like you have a poppet valve thats sticking.(assuming that the electrical side of the #2 cyl is good to go) The only thing on the ignition side you changed was the cap and rotor right?
Hard to imagine getting a misfire on #2 when all you changed was the cap and rotor as long as the plug wires are fully seated.
What was the reason for changing the CPI ? What all did you replace? Just trying to help
_____________________________
2001 s-10 Blazer LS 4.3 5 spd 2wd
2004 Kawasaki ZRX1200
1986 K-5 Blazer 4x4 420ci 700r4 4in lift 33's
1979 c-35 1 ton dually 505 4L80E
1971 ElCamino SS 496 6 spd 4.56 posi
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RE: #2 cylinder misfire - 11/3/2007 7:20:04 PM
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megtom2
Posts: 55
Joined: 7/11/2007
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The cpi was shot. There was gas puddled and it ran extremely rough.
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RE: #2 cylinder misfire - 11/4/2007 4:35:41 AM
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megtom2
Posts: 55
Joined: 7/11/2007
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OK, I'll give the history.....
1995 Blazer. CPI W engine.
The engine started having a bad lope and foul odor coming out of the exhaust. I had already changed the plugs, egr and oxygen sensors. I entered the plenum hoping to just change out the FPR but had to change out the entire CPI because there was gas pooled all around. I also changed out the nut kit while in there along with changing out the rotor and cap since it is soooooo much easier to do with the plenum off. I have gone from a lope and foul exhaust to a blinking SES light and #2 cylinder misfire.
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RE: #2 cylinder misfire - 11/4/2007 12:23:59 PM
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blzR
Posts: 141
Joined: 2/8/2007
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1995 Blazer. CPI W engine.
engine started having a bad lope/ foul odor out exhaust..changed plugs, egr and oxygen sensors.. changed entire CPI, nut kit, rotor and cap
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Trust me when i say "I feel for you" as i have been fighting the very issue you are combating for 14mths now!
Something to think about, i have, replaced everything with new parts that you have Plus:
New Catalyic Convertor,Exhaust,IAC,TPS,Cleaned out entire plenum/top end,PCV valve,new Battery.
Now into the $1000's later= '95 Blazer still all fartsy what with the lope/crap running and all.
I'll follow all inputs to this issue v-e-r-y closely ! Good Luck!
< Message edited by blzR -- 11/4/2007 2:42:54 PM >
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RE: #2 cylinder misfire - 11/4/2007 12:52:55 PM
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megtom2
Posts: 55
Joined: 7/11/2007
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I now wish I had kept the lope and 10 mpg. I can't even drive it down the street now.
My mechanic suggested changing the #2 wire again because they are just so easily broken. I might have frucked it up when I changed out the cap. He did at least say the new cpi is probably not the problem. Oh well, I don't feel like buying the entire wire set so I will have to wait until tomorrow when the place that sells a single wire if that is all you need is open. I'll keep everyone posted.
I'm to the point of wondering if AllData.com's diagram of the firing order is wrong. For those that know for sure the #2 cylnder is the closest to the front of the engine on the passenger side and the first one on the pass. side cap to the engine???
< Message edited by megtom2 -- 11/4/2007 12:59:38 PM >
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RE: #2 cylinder misfire - 11/4/2007 4:33:54 PM
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megtom2
Posts: 55
Joined: 7/11/2007
Status: offline
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My impatience made me unplug the 2 wire and change it out with the 4 wire. Still a misfire in cylinder 2. DAMN!
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RE: #2 cylinder misfire - 11/5/2007 1:46:01 PM
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blzR
Posts: 141
Joined: 2/8/2007
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foul odor coming out of the exhaust
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Something to ponder on: Rotten egg/foul odours are common symptoms of a Catalyic convertor gone bad/plugged/not functioning properly, i sprung for one as something inside convertor was rattling.
< Message edited by blzR -- 11/5/2007 1:55:05 PM >
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RE: #2 cylinder misfire - 11/5/2007 2:35:41 PM
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megtom2
Posts: 55
Joined: 7/11/2007
Status: offline
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The blazer is at my mechanic's shop this afternoon. I figured they have the dianostic equipment to check over the entire ignition system. Lindertech emailed me today and said it COULD be the cpi spider. They said there was a chance the #2 poppet is clogged and for me to pop it with a finger and then to cycle the fuel pump with the injector unplugged and pointed into a cup to see if fuel is indeed coming out of it.
Since it is 4:30 and the mechanic's shop closes at 6 I am afraid they are coming up with nothing on the ignition. Sounds like I may end up revisiting the inside of the intake once again.
Just got the call. Ignition system is A-OK. It is a fuel problem which tells me the #2 poppet is acting up. If I can't get it to work I guess I'll be sending this one back along with the old one to collect my core charge. Dang.
< Message edited by megtom2 -- 11/5/2007 3:07:00 PM >
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