99' Balzer Rough Idles

[BrianCav]

I have a 99' blazer 4X4 w/60k. I bought it with 50k and its been great until the past 2k miles.I have a really rough idle. I was told to replace the plugs wires and rotor cap, but I havn't yet. instead I replaced the EGR valve, because thats what a few friends recommended
I repaced this at a cost of $120.00 and i still have the same rough idle.also the check engine light has been on.
Is there anything else I should try! Should i do the plugs and wires?????????
Any help would be appreciated

Brian

[friesza]

I am no expert...but others in here have suggested going to like Schucks or Autozone and asking them to run the codes....they usually do it for free...and maybe from there you could figure it out...also could be bad fuel, pcv valve, O2 sensor...I just dont know...but I bet BlazerLt might ...he will probably respond soon. I once got cheap gas and mine ran like crap for quite a while and finally I now only run chevron product...seems to like it...

[Cloud Strife]

When was the last time there was a tuneup on your Blazer?

Have you replaced your fuel filter yet?

[BrianCav]

friesza,
Thanks for the response.I do have a auto zone near me so i'll have them run the codes.I was pissed spending $120.00 and not fixing the problem.like you said it could be bad fuel the 02sensor or the pcv.
cloud strife had a point with the fuel filter too

Originally Posted by BrianCav

I have a 99' blazer 4X4 w/60k. I bought it with 50k and its been great until the past 2k miles.I have a really rough idle. I was told to replace the plugs wires and rotor cap, but I havn't yet. instead I replaced the EGR valve, because thats what a few friends recommended
I repaced this at a cost of $120.00 and i still have the same rough idle.also the check engine light has been on.
Is there anything else I should try! Should i do the plugs and wires?????????
Any help would be appreciated

Brian

[drdd]

yup ...

with 60K ... bout time for a tune-up - search the forum ...

wires, plugs, cap, rotor, pcv, clean throttle body, fuel filter, air filter, clean IAC ... possibly cat and O2 sensors ...

start with the cheap stuff ... if that doesn't fix it ... well, it would've needed done soon anyways ...

if it were me, I'd start with cleaning the throttle-body and IAC and fuel filter ... just my 2cents

Originally Posted by Cloud Strife

When was the last time there was a tuneup on your Blazer?

Have you replaced your fuel filter yet?

[dmbrisket 51]

yes, it probibly needs a tuneup, a gm tuneup, plugs, wires, cap, roter, pcv, fuel filter, air filter, lower intake manifold gaskets, gm's replacement ones are now aluminum and not plastic, and use only delco platnum plugs, and a decent set of wires

[BrianCav]

Thanks guys for all your tips.I 1st did the EGR valve.that didn't work so than I did pvc valve and O2 Sensor.Truck ran smooth for 5 mins.than it went back to a rough idle again.
So I did what you guys said and got a free dianostic from Auto Zone.The print out showed a missfire on piston 4.So I assume its the plugs and wires??
I pushed on them to make sure they were tight, it didn't work so now I'm going to take it to a mechanic and have them replaced I hope this solves the problem?
I also bought a gas filter that I will change.Could you guys tell me where this would be located?
Also do you think replacing the plugs,wires,and cap will it stop the missfire??

[Jeremy Fitch]

Fuel filter is under the drivers side door against the frame rail.