Last post on Nov 12, 2011 at 7:53 PM
You are in the Chevrolet Suburban & Tahoe
What is this discussion about?
Chevrolet Suburban, Chevrolet Tahoe, Chevrolet C/K 1500 Series, SUV
#27 of 36 Re: Common missfire issues... [hquick]
Mar 22, 2010 (1:53 pm)
Good call, re; the distributor gear, many miles will wear the gear as you describe. That info coupled with the spider info should eliminate much of the guess work about multiple misfires in the many past posts calling for help. When a misfire is localized to a specific cylinder and not random one of the two mentioned above is more than likely the culprit. As far as cleaning the spider - Agreed, you've come this far, replace it (Parts, and Labor it isn't cheap though ). If you want a cheap try - go to your local Yamaha dealer and get a bottle of Yamaha Ring Free and shock treat according to instructions on the bottle. Forget the fuel injector cleaner stuff - Ring Free is designed to destroy carbon. OMC also has a product, just not as concentrated so you use more but they both are effective carbon control. To my knowledge they do not harm O2 sensors.
#28 of 36 Re: Tahoe misfire update [rem222]
Mar 22, 2010 (2:15 pm)
Did you change your O2 sensors on the side with the misfires?
#29 of 36 97 suburban misfire problems
Aug 14, 2010 (5:21 pm)
bought a new 5.7 crate motor for our 97, installed it with new spider injectors, new distributor cap & rotor and fired it up to a misfire problem we can't seem to fix. Cyl.#3 is the one causing the problems, changed plug already and it's still doing it. Going to change O2 sensor next, but any suggestions from anyone would be helpful.
#30 of 36 Re: 97 suburban misfire problems [momsbus]
Aug 14, 2010 (9:06 pm)
I don't know how many people I've already told this to but it is your O2 sensors. Trust me, trust me, trust me. Simply unplug your left upstream sensor and fire it up, if the misfire is gone then that's the one. If not, do the same thing with the right (upstream) sensor and fire it up. How much did the engine cost?
#31 of 36 97 suburban misfire problems
Aug 15, 2010 (8:13 am)
I will go with your suggestion,but I don't understand how a bad O2 will cause only one cylinder to create a misfire? I have changed the plug (has been changed 3 times)-plug wire checked and a injector balance check done on all 8 cylinders
which all check out working correctly. I have an good scanner and it shows the upstream 02's working (Correctly I'm not sure of the parameters) I have even removed the upper plenuim to check that the new injectors were seated properly. The motor cost a little over 2k plus a new distributor and injector spyder and all filters and fluids and knock sensor and temp sensors and gaskets.
Thanks for the input and we will run with it, Any other thoughts let us know
#32 of 36 97 sub misfire
Aug 15, 2010 (3:01 pm)
Changed all 4 O2 sensors and I still have #3 and now #5 giving us a misfire......any other suggestions? Anyone? Gonna take the plenuim off again to check these two injectors....but any suggestions are welcome.
#33 of 36 1997 chevy 1500 5.7 misfire
Nov 12, 2011 (12:52 pm)
I have read your reply`s but try this one on for size and if anyone can help i would reall appreciate it.
I have a 97 chevy 1500 withh a 5.7 vortec. I started developing a misfire every once and a while. maybe every 3 0r 4 weeks to 6 weeks apart, Then started getting it everytime i accelerated a little more than usual or going up an incline for a decent amount of time. First of all changed the fuel filter to see if it was clogged, no help. Second the plugs and wires which have been changed 3 times currently with ac delco double platnum irridum. no help still have a missfire. Changed my distributor cap and rotor cap 2 times to make sure no cracks, still misfire after going down the road and accel to higher speed. Pulled off the upper intake expecting to find poppers in there but no, it had spider already installed, but guess what, I pulled it and put a new one in, making sure all injectors are in correct cylinders. Checked this 3 times before putting upper cover back on.Still misfire continues. Then the fuel pump goes out, how convienient. Replaced the entire assembly. still missfire continues. I replaced the ignition coil, no help. finally discusted after having the caty convertors checked and testing the 02 sensors which all checked out fine, I had a new distributor put in yesterday. took of from the shop and got 3 miles away and missfire on #5 has once again returned. NO vacume leaks and not bad compression. Idles great and starts perfect runs great until you accel too much or going up a hill or sometimes out of nowhere it starts in again. I have gone 2 to 3 days without it doing it off and on , but it comes back. Crankshaft sensor , camshaft sensor timing on dist, plugs all on the mark. what do you think about this one????? Contack me personally if you like at dennytesstnctv.com
#34 of 36 Re: The answer is....... (drumroll please) [steve_]
Nov 12, 2011 (7:53 pm)
whats the drumroll for? iIt didnt fix the problem! Appreciate your info anyway.