Engine dieseling & hesitation

[rottnchi]

To start, I have an '04 Av 1/2T w/a 5.3 gas engine that I've had since new.? I installed a K&N FIPK kit on it, but the below issues were going on before this.

When I am in the 45-50 mph range and push the gas pedal down (as if to keep speed going up a hill), I get a noise that sounds like dieseling.? What you'd get on the old style engines if it wasn't timed right.? It is hit and miss getting it to do this, therefore can't take it to the shop to get it fixed under warranty.? (I bought 5 yr/60,000 miles)

The other problem that is easily repeatable is the slight hesitation I get when I stomp on it.? It's a random small hiccup until it gets up over 50mph.? Do you all think the two could be related?? And, is the dealer able to hook up to a computer and find out the problem or are they required to witness BOTH problems in order to even start?

Thanks,
Lisa

 

[m02redl]

you could try taking  it to a auto parts store such as Kragen or Autozone and see if they can pull any codes for you, they usually do that for free 

 

[sperry]

I'm not familiar with the "FIPK" specifics but if it's an oiled filter, they contaminate the MAF (Mass Airflow Sensor) and in addition to it running bad there's transmission shifting issues.

NAPA has a spray can to clean the maf sensor fine wire if that's the case.

If so, :

Info - Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Use of an Excessively/Over-Oiled Aftermarket, Reusable Air Filter #04-07-30-013A - (Jan 25, 2005)

2005 and Prior GM Cars and Light Duty Trucks

2005 and Prior Saturn Models

2003-2005 HUMMER H2

This bulletin is being revised to add additional model years and to clarify warranty coverage. Please discard Corporate Bulletin Number 04-07-30-013 (Section 07 -- Transmission/Transaxle).

The use of an excessively/over-oiled aftermarket, reusable air filter may result in:

  ? Service Engine Soon (SES) Light On
  ? Transmission shift concerns, slipping and damaged clutch(es) or band(s)
  ?    Engine driveability concerns, poor acceleration from a stop, limited engine RPM range

The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur.

When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively/over- oiled air filter. The MAF, GPS reading should be compared to a like vehicle with an OEM air box and filter under the same driving conditions to verify the concern.

The use of an aftermarket reusable air filter DOES NOT void the vehicle's warranty.

If an aftermarket reusable air filter is used, technicians should inspect the MAF sensor element and the air induction hose for contamination of oil prior to making warranty repairs.

Transmission or engine driveability concerns (related to the MAF sensor being contaminated with oil) that are the result of the use of an aftermarket reusable, excessively/over-oiled air filter are not considered to be warrantable repair items.

 

[ygmn]

Noise when stomping gas pedal... if it sounds like teath rattling in a metal jar..

that is a KNOCK caused by predetonation...

This can be caused by bad gas, bad timing, bad engine part... but not serious at first..

the other issue could be related..

Suggest doing what wild fire says first

 

[sperry]

I wouldn't be surprised about a bad gas problem either.

Perhaps the knock sensors are bad and the system can't adjust for poor fuel?

Yup, read those codes!

 

[itsstopher]

If you are close to Fairbanks I have a scanner and a can of MAF cleaner and two new knock sensors.

 

[Bad Dad]

Lisa,

Sounds like a "knock" problem to me too. I'd try a can of "Sea-Foam" motor treatment in the gas, and a fill up with premium fuel. The Sea Foam goes in the gas tank and will clean your injectors, and the carbon deposits in your motor. You can get it at almost any auto parts store (NAPA, Schucks etc.), and the stuff really works!

Like ygmn say's... it's not serious at first, but you have find the cause and fix it -- cause it's not good!

Tony