Oldblue

My 1988 C1500, just had the intank fuel pump filter sock!

califphil

Around 2006 is when GM quit the external fuel filter. My 2003 GM SUV had one but the 2006 GM SUV replacement does not. When I replaced my HHR fuel lines, I thought about cutting the plastic line and installing some fittings and a good WIX filter but decided against it, It made it 113k miles with out one, it should go another 50k miles and by then I will be ready for another HHR with lower miles.

Rocket Surgeon!

Excellent feedback, but...
Actually it does, it is not "inline", rather it is at the fuel pressure regulator at the pump, as it is at the regulator it is inline after the pump.
2carpros.com/questions/fuel-filter-16546916
All three engine options use the same pump assembly.

All three gas engine options should have WIX 33481
The Diesel option uses a odd filter box WIX 33136


Back to HHRs,
Adding a filter to the line appears like a good idea as I suspect the failures are caused by clogging. One caveat is that a filter might increase the load on the fuel pump shortening its longevity.

It appears the 06-07 injector has smaller orifices than other year injectors. The decrease in size should be an exponential increase in particle that are of that dimension. The actual specification may be proprietary, as well as with other injectors. I am attempting to measure and/or estimate and process data on this right now.

Back to testing: The current injectors that are in the car, 12582219 from an 05-10 cobalt are performing quite well. Car runs fine, no codes, and fuel trims are very reasonable during acceleration, cruise and idle. Long-term fuel trims at cruising speed usually vary between zero and +2, often hovering around +1.3. At idle they seem to hover near zero, often just slightly negative but appear to vary to + or - 1.5. Hard acceleration seems to become richer maybe about +5, but during a deacceleration from high speed did see the number jump all the way to -20 for just a few seconds.

These are "25 lb/hr", but I did not find backup/secondary confirming injector data yet. If I assume the accuracy is 25.0 vs the expect 25.1 stock, the error in trim and mileage should be 0.4%. I will fill up tomorrow to calculate actual vs cluster calculated mileage.

firemangeorge

And as I stated, my Dodge does not have an "in line" filter (that's what was being discussed: the absence of in line fuel filters. ) Not saying they don't have any kind of filter at all.
FYI. I've been turning wrenches for many years. Used to be a tech and did all types of automotive repair for a living many years ago. Just work on my own stuff now that I'm retired.

Oldblue

I owned that truck for many years, did a body off frame clean up and frame paint, there was never a fuel filter

TruckerKevin

Well now

I came across this thread just trawling the site learning all I can about these cars since I am a new owner of an 06 HHR with a 2.4 (non turbo).
The car has obviously been neglected by the previous owners dues to signs of sludge inside the motor, original filters plugs etc.
I have come across a P0303 code (cylinder 3 misfire) that I am suspecting to be an injector (due to swapping coil packs, new plugs, etc).

I am going to attempt to clean the injectors, If I decide that I want to replace said injector, what would be the best course of action? Just stick with the same OEM part number, or replace all 4 with an upgraded part, trying to find someone to reflash the computer? The car has 152,000 miles on it.

Although I do not know any previous history, 152K doesn’t seem to be too bad if the original injectors are still on the said motor

Oldblue

That P0303 could be an injector, check the wire harness and move the injectors around, maybe just swap #3 with #1, and see if the code changes to P0301.

TruckerKevin

Yes sir, as soon as the temperature gets above 20 degrees today I am heading out there lol

Rocket Surgeon!

Nice Truck! I tried but missed on on a k2500 long cab, long bed with MTX. Still watching. Upgraded facia? Some vehicles with carbs may have the first filter inline at the carb under the hood, could that be your case? Likely the same with TBI...


Swapping questionable injectors, plugs, etc is the best way to diagnose. I would switch plug, igniter, and injector each to a separate different cylinder. It could be any of the three, and the code will tell.


I did two tanks of travel to get a standard average, including returning to the same gas station from first to third tank

first tank
159.4 miles / 6.288 gallons = 25.35 real mpg
27.1 cluster mpg
= -6.5% error

second tank
379.6 miles / 13.930 gallons = 27.25 real mpg
26.5 cluster mpg
=+2.8 % error

Two tank average:
(159.4 miles + 379.6 miles) / (6.288 gallons + 13.930 gallons) = 539 miles / 20.218 gallons = 26.66 real mpg

calculated average of the average cluster mpg
total miles * (1st tank miles / 1st tank cluster MPG + 2nd tank miles / 2nd tank cluster MPG) = total cluster MPG
539 miles * (159.4 miles / 27.1 cluster mpg + 379.6 miles / 26.5 cluster mpg)
gave me 26.675 average cluster mpg

error = 26.675- 26.66/26.675= .015/26.66=0.05%
vs the expected error of 25 vs 25.1 = 0.4%

The number are basically dead on. I therefore state that substituting 12582219 a 25lb injector from a 05-10 cobalt or 07-10 G5 ecotec into a 06-07 2.4 car is a solution that requires no programming if that car was still running the stock injector, which presuming that car had not been re-programmed in accordance with the aforementioned TSB. I further theorize this injector will also work in 06-07 2.2 powered HHR as it uses the same 12 hole injector.


I started calculations on injector sizing, but the calibrated caliper I was using was discovered to be inconsistent and therefore defective.
If you do have programming options I am thinking a different solution will be best, and the theoretical math I started gave me an "efficiency co-efficient" to which injector would be best. Later for that part of the project.

TruckerKevin

10-4. I think what my ultimate question was, if I had to replace an injector would I be better off just getting one to match the other 3 or replace all 4 with an upgraded version? (As in reference to this entire thread)