rough idle plz help
#1
rough idle plz help
My 2000 Blazer 4.3L began this problem a week ago. I have since replaced the following with no luck: Distibutor cap and rotor, spark plugs and wires, and spider injector. I have done some research and possibilities are vacuum leak and/or fuel pump. Above about 30 mph it runs fine but slower speeds cause sputter and very sloppy acceleration. I'd much appreciate any advice!
#3
Yes I checked fuel pressure yesterday. If I remember correct, on filter was 88psi and only dropped to 60 after 10 minutes. I also connected it under the hood and although I don't remember the numbers, I know the pressure was good and held. Today I cleaned the MAF sensor and Idle air control valve which reduced the roughness but didn't eliminate it. My SES doesn't flash anymore! Lol oh.. I have been getting P0300 code since it started. Thanks for your reply I hope to hear more!
#4
Have been busy with maintenance for a week! Ran a compression check and cylinder 6 had no, I repeat, zero pressure.. with no previos valve/cylinder experience, I dove headfirst and pulled out what I believe people call the head. To find that the smaller valve on the said cylinder 6 is bent and cannot close all the way. Thank god it wasn't worse. Thanks for everyone that posted, you were so much help.............................................. ............................... *cricket*
#5
Just some questions for reinstallment.. 133000 miles on 2000 blazer and found a bent valve. Should I replace head? I don't wanna go through the procedure again so any advice as to simply replace the valve or go for the whole head. I'm not usually a smartass like last post, I just thought this site would be more helpful.
#8
Ok so no new head, but the bent valve damaged the piston a bit. Not a hole in it by any means but there is definitely damage. Wondering if that will effect anything? I really appreciate your guys' inputs I'm pretty new at this
#9
also need to know the chance of this happening again. to me it seemed like the valve and piston only collided once or twice. so i'm choosing to rule out a timing issue, I hope it was just stuck from being heavily coated in carbon.
Thread
Thread Starter
Forum
Replies
Last Post
blazerguy22
2nd Generation S-series (1995-2005) Tech
10
11-14-2013 11:50 PM
97BLAZE4X4
2nd Generation S-series (1995-2005) Tech
1
02-07-2010 07:33 PM