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Head cam swap done.
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Mon Aug 07, 2006 10:55 pm    Post subject: Reply with quote

smokemup wrote:
10sec.et wrote:
if the brake booster port was leaking, wouldnt you have high fuel trim on BOTH banks? can you watch short term fuel trim while spraying carb cleaner (in small ammounts) around the right bank? as soon as you hit the vac leak your STFT will drop significantly.

I haven't pulled out the carb cleaner to try to find it.

The brake booster port connects right on the back of the manifold next to cylinder number 8. Yes it should affect all cylinders not just the passenger side.

My approach to problem solve is to run the diagnostic tests from the computer to see if I can isolate it to a specific cylinder.

If not spray the hoses down with carb cleaner looking for a vacuum leak.

If that doesn't work pull the plug wires, and plugs to see if I see anything funny, do a compression test and a leak down test.

If that doesn't work swap coil packs to see if the problem follows to the other side.

If that doesn't work swap O2 sensors and see if the problem follows.

If that doesn't work pull the intake and see if anything is funny.

If that doesn't work run away!

I drove the car again tonight for another datalog, still going very easy on it. Even though you know something isn't right, running on less than 8 cylinders the car feels pretty responsive. I'm hoping it will really scream once I sort out these problems.


I say let the throttle do the talking let er rip!!! then RIP. Just kidding Smoke! Be persistent you will fix it!
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artinla
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Joined: 09 May 2006
Posts: 233

8558.30 points


1971 Chevrolet Nova

PostPosted: Tue Aug 08, 2006 12:46 am    Post subject: Reply with quote

My money is on the O2 sensor. Hope you find the problem quickly and without a lot of effort.

I want burnout videos, not "Oh Shit" posts.

J/K.. Good luck.

Art
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jeep_406
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Joined: 12 Sep 2002
Posts: 1661
Location: Tewksbury, Mass 01876
53123.48 points


1972 Chevrolet Nova

PostPosted: Tue Aug 08, 2006 8:09 am    Post subject: Reply with quote

SMOKE,

How high of a reading can you get out of the suspected O2?
02's never fail high and I know they don't care for antifreeze.
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Tue Aug 08, 2006 1:52 pm    Post subject: Reply with quote

Jeep....the O2 values on the troublemaker side are all low. However I'm not sure it's the O2's fault. The reason is the injector pulse width is the same on the passenger side as the driver side (good side).

I'm hoping to work on it tonight. I'll let you know what I find out.
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Tue Aug 08, 2006 10:50 pm    Post subject: Reply with quote

I messed around with the car for a while tonight and I pulled the plugs and did a compression test on cylinder number 2,3,4,6 (I skipped 8 because it's a total bitch to get at) and all of them were about 195 - 200 cranking. See pictures of the plugs below. All the passenger side plugs were completely black. I pulled one driver side #3 and it looks much better than the passenger side.

I'm pretty sure the problem is the O2 sensor. After pulling the plugs and checking everything under the hood the only common thing that relates all the cylinders on the same side is the O2 sensor. I plugged in the notebook and started scanning with the key on but engine not running. The drivers side O2 was logging about 440 mv and the passenger side was around 100 mv and never moved. So I went to the parts store and picked up an O2. Came back home and tried to get the old one out and it didn't want to come. After breaking the tip off my 3/8" wobbler extension (damn I hate that). I broke out the torch and heated the pipe around the O2 which was still a bitch to get out but it came. Well the threads in the pipe are toast and I don't have an O2 tap. So tomorrow I need to get an O2 tap, hopefully the threads will clean up so the sensor will fit and fix the engine missing / misfire codes.



plug_4.jpg
 Description:
Plug #4. Looks terrrible.

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plug_3.jpg
 Description:
Plug #3. I pulled one from the driver side for a comparison and this plug is light years better than the passenger side plugs.

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 Filename:  plug_3.jpg
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plug_2.jpg
 Description:
Plug #2. Looks terrible.

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 Filename:  plug_2.jpg
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plugs.jpg
 Description:
A picture of plugs 2,3,4,6,8 (note: plug labelled 1 should be labelled 3).

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 Filename:  plugs.jpg
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Wed Aug 09, 2006 12:06 am    Post subject: Reply with quote

I was thinking if I can't fix the exhaust then it must be time for headers Devil
This set up would be really nice on my car.QTP Headers.
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jeep_406
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1972 Chevrolet Nova

PostPosted: Wed Aug 09, 2006 12:22 am    Post subject: Reply with quote

Would you be getting a complete exhaust system?
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SMOKEmUP
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Joined: 30 May 2002
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65097.54 points


1979 Chevrolet Camaro

PostPosted: Wed Aug 09, 2006 8:32 am    Post subject: Reply with quote

jeep_406 wrote:
Would you be getting a complete exhaust system?

I would love to put an exhaust on the car and it would be the whole thing, front to back. It would probably be those QTP stainless headers, catted Y-pipe, electric cutout in the I-pipe and an SLP dual dual cat back. But that's a lot more money than I have. Therefore I'm hoping the O2 thread will clean up.

If this cures the problem then I can start tuning the car. (fingers crossed).
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jeep_406
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1972 Chevrolet Nova

PostPosted: Wed Aug 09, 2006 9:01 am    Post subject: Reply with quote

I hope all goes well.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Wed Aug 09, 2006 8:47 pm    Post subject: Reply with quote

I just messed up a new O2 sensor trying to get it in. I thought I had the threads cleaned up enough to make it work and sure enough I didn't. Argh!!!!

I think it's time for exhaust.
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Wed Aug 09, 2006 10:19 pm    Post subject: Reply with quote

if i remember correctly, a sparkplug thread chaser for the 13/16 size spark plug has the same thread as an O2 sensor. if it will work it may save some time.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Thu Aug 10, 2006 8:19 am    Post subject: Reply with quote

10sec.et wrote:
if i remember correctly, a sparkplug thread chaser for the 13/16 size spark plug has the same thread as an O2 sensor. if it will work it may save some time.

That's what I used to try and clean it up.

I made a mistake when I put the new one in. I used the spark plug thread chaser and got it to the point where it was threading in tight but ok. So I decided to go for it and put the new O2 in. I was able to put the O2 in but it was really tight turning and didn't bottom out. Fearing an exhaust leak I gave the wrench a bit too much twist and the O2 stripped and then it just went down hill from there. It's at the point where it needs a helicoil and another new O2 sensor.
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Thu Aug 10, 2006 8:29 am    Post subject: Reply with quote

although a bitch to remove, you can get just the fitting for the O2 and weld in a new one. i think Summit and Jegs have them.
_________________
af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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artinla
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Joined: 09 May 2006
Posts: 233

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1971 Chevrolet Nova

PostPosted: Thu Aug 10, 2006 9:14 am    Post subject: Reply with quote

Crap man, that sucks.

I hope it isn't a real bitch to fix it. I am dying to hear how it runs when you do.

Good luck,

Art
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Thu Aug 10, 2006 11:43 pm    Post subject: Reply with quote

I think I scored a used set of cats of an 02 Camaro with O2 sensors for cheap money. I'm sending out the money order tomorrow and hopefully this guy will be quick with shipping so I can get this thing running!

However I would have loved to put a new exhaust on the car but I don't have $1,600 to drop on the car now.
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