Recent content by Big_Red9
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1997 Chevy Suburban K1500 P0420
Hi everyone, So I shortened the gap on all of my spark plugs to 0.050". After putting them back in, I floored it up a hill again and got her to misfire. You'll see in those pictures that it doesn't look any different than what I've posted before. Again, between the vertical red lines is where... -
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1997 Chevy Suburban K1500 P0420
I have not tested the spark power. So far, I've only verified that I am getting spark on all 8 by using a timing light. Also, about a month ago I rigged up a timing light from under the hood into the cab and replicated a misfire for all 8 cylinders. It was quite the jerry-rig. What I was looking... -
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1997 Chevy Suburban K1500 P0420
I have been able to verify that my EGR valve works. I hooked the pins up to 12V while I had it out and saw that it actuates. I also cleaned it up and checked the wire harness with a multimeter. I don't think this is what's causing my problems. -
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1997 Chevy Suburban K1500 P0420
Hello again, I apologize for not checking in sooner; I've been plenty busy between work and school. I have some updates for the community: 1.) I've been driving around with my new distributor cap & rotor. It may be in my head, but I feel like she likes it better than the last one. I don't have... -
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1997 Chevy Suburban K1500 P0420
I made sure to get the vented one. I should've also included that info. -
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1997 Chevy Suburban K1500 P0420
Good evening folks, I have all the spark plugs out as you can see in the attached photo. #4 was the only one that came out looking a bit wet. The rest were pretty much in the exact same condition. They all had a gap of 0.06" which is no different than when I put them in. I don't think their... -
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1997 Chevy Suburban K1500 P0420
After seeing everyone's input here today I decided to pony-up and buy a United Motor Products premium cap and rotor from RockAuto. It'll be here by Monday and I will follow the installation with some road testing. Before then (maybe tonight) I'll post some pictures of my spark plugs. Stay tuned! -
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1997 Chevy Suburban K1500 P0420
I believe there's some sort of screen in the housing that I have never taken a good look at. I'm hesitant to load up the parts cannon again, but if the state of the cap and rotor are that concerning then I wouldn't mind doing what's best for my ol' girl. Some more context too: I live in... -
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1997 Chevy Suburban K1500 P0420
The emissions testing in my area is a visual inspection of all emissions related components so if I remove them it would fail inspection. There's probably some work-arounds that can be done, but I am uninterested in pursuing those options at this point - it would probably be more work than... -
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1997 Chevy Suburban K1500 P0420
Hello Road Trip, Here's pics I took last night of my cap and rotor. I didn't see any sign of damage on either part, but what's tough to see in the picture or the cap is some white flaky stuff on the terminals. The rotor's copper tab also looks to have some minor corrosion at the end of it. Not... -
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1997 Chevy Suburban K1500 P0420
So I drove her pretty hard on my way home from work. I floored it up a hill on the highway and, to my disbelief, I could not get it to misfire. However, the data shows some odd things. As you'll see in the attached pictures, I marked the sections where I floored it up the hill with red vertical... -
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1997 Chevy Suburban K1500 P0420
Thanks for the warm welcome and in-depth response! I should have included originally that this is a 5.7. Also, that 3 minute data snip was just from my drive to work today without any misfires or other problems triggered. I have cleared my codes many times while I've been dealing with these... -
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1997 Chevy Suburban K1500 P0420
I guess it may be worth getting them tested. Is there a chance this could help my misfire problems? Assuming new cats make my downstream O2 sensors read normal again, but it is my understanding that the computer is reading only the upstream sensors to adjust AFR. This makes me worry that I could... -
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1997 Chevy Suburban K1500 P0420
That is certainly a possibility. I just thought I'd see an indication of bad cats with other tests I did. Unless they can just go bad without being plugged. It also doesn't exactly explain the misfires under heavy load. -
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1997 Chevy Suburban K1500 P0420
Hello GMT400 world, I am a new poster to this website, but I've been scrolling through these forums for the past ~6 months. After putting countless hours into my newly acquired '97 Suburban, I figured it's time to finally post the issues I've been battling with in lieu of going to a mechanic...
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kennythewelderOfficially Retired, B31-3 (6-G) certified welder.