Hesitation, staggering on acceleration and poor gas mileage.

[JoshBarber]

I know this is blurry...but...

although it was changed out less than a year ago, I just pulled the PCV to check it out as well. rattles freely-allowing flow one way only...which I know is the main function....but it shows signs of what looks like burnt fuel (brownish buildup). Just wanted to ask if thats normal or a sign of any other issue?

[534BC]

A couple more questions to help us help you if you don't mind.

what was the mpg before ? and for how long?
what is the current mpg ? and for how long?

[JoshBarber]

Originally Posted by 534BC

A couple more questions to help us help you if you don't mind.

what was the mpg before ? and for how long?
what is the current mpg ? and for how long?

I dont know to be honest. It was pretty much average for most Blazer owners before...and its dropped a HUGE amount all of a sudden.

[Lovedb4ever3]

anytime u change wires for a misfire your gonna wanna chane the plugs too because the longer they r not being fired the more fouled they r getting. Im sure some are fouled out pretty badly by now and they wont clear up with everyday driving.

[Teal95Jimmy]

Are you driving with the A/C going or the front defroster or blend on. Using that with the air temp being above 40 degrees F will cause the air conditioning compressor to kick on.

AC compressor on=more load=more gas to do same amount of driving

Check under the hood anyway, there might be a sticky switch or relay that's keeping the compressor going.

[Teal95Jimmy]

Also where you getting your gas? Have you changed brands lately? Some stations are now using a blend of gasoline and ethanol. Dont know if that will help or hurt mileage, mine doesnt like the 10% ethanol blend.

[JoshBarber]

Originally Posted by Lovedb4ever3

anytime u change wires for a misfire your gonna wanna chane the plugs too because the longer they r not being fired the more fouled they r getting. Im sure some are fouled out pretty badly by now and they wont clear up with everyday driving.

does anyone agree with this?

[Cloud Strife]

Is your poor mileage over just one tank of gas? Because it is possible you could have gotten a poor batch from that Gas Station. Try a different one like Sunoco, Shell, Exon. Those are usually the higher quality stations at least in my area. The local SuperAmerica is causing horendous mileage on several family members cars. They are averages 50MPG lower.

They should be changing over to summer grade here shortly, but we have to wait for the Winter Grade to dry up first.

[MT-2500]

Originally Posted by JoshBarber

also I plan on replacing the fuel filter tonight...although I seriously doubt it caused this sudden drop in gas mileage. Would lean more towards whatever is causing it the hard start when its been sitting

If you are having a hard start cold.
Here is one thing to check but the fuel pressure specs will depend on year and engine and engine code. Which you have not gave us. Post them back.
MT

Hard to start cold.
Check cold start fuel pressure.
Check engine running fuel pressure.
Check engine running on the road fuel pressure.
Then shut it off and watch for fast leak down.
Pinch off at rubber part or block off return line and check full pressure.
Later V6 and V8 gm engines should have 60-66 fuel pressure.
Cold start should be 64-65 lbs of pressure.
If you do not have full fuel pressure on a cold start the injectors will not squirt fuel.
Do not leave home without it.
Engine running should be 60-66 lbs pressure depending on engine load.
Full pressure with return pinched off should be 75-85 or more.
And if it has a fast leak down after shut off you have a leak.
Post back fuel pressure readings.

[534BC]

somewhat agree.

I would do the cap, rotor, wires and plugs all at the same time if they were being changed because they were very old and had high miles.

If not then I would disagree and only change the bad component.

[534BC]

My symptoms are a bit like yours, but very intermittent and light. It seems to be worse when it is wet , cold, or when all the lights, fans are on.

I can't remember where, but vagualy remember something about unhookling alternator and testing injectors with lower voltage.. I wish I could remember, because My problem is nearly non-existant with no lights on.

[JoshBarber]

they werent being changed due to old age. they're about one year old. which is pretty new in my opinion. I changed them out because I saw the ARCing.

Unfortunately, the surge problem pursists. Any suggestions let me know.
Im starting to really lean towards believing its a fuel pump or pressure leak as I said before. Hard start after it sits persists as well.

[muzzy1maniac]

Josh,

Where exactly was the arcing?

[JoshBarber]

Originally Posted by muzzy1maniac

Josh,

Where exactly was the arcing?

Hey Muzzy -

Re-read post #9

[JoshBarber]

Originally Posted by AChatham

How did it turn out?

This DID NOT solve the problem......search continues