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Misfire po304 2006 hhr 2.4 - 2006 Chevrolet HHR

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My 2006 hhr just recently started misfiring ,codes have said to replace the thermostat and sensor,changed plugs air filter and it's still misfiring,if I let it completely cool down it runs great??


First off codes don't tell you to replace anything ! The codes are there to point a trained technician in a diagnostic direction ! Testing electrical circuits , computer logic ,an sensor data. An more then likely you have a bad coil or ignition module !

May 07, 2016 | Cars & Trucks

1 Answer

I have a 2007 Chevy hhr and the codes are p0102 p0113 p0171 and p0300 it won't start when I first turn the key but when I do it the second time it starts up so what could be the problem


p0102 is your Mass Air Flow device.
p0113 is "air intake temperature" sensor voltage too high.
p0171 is "engine running too lean"
p0300 is "random misfire"

You can pretty much ignore your p0113, p0171 may be caused by a bad MAF, and p0300 may be caused by your p0171.

the actual indication for your MAF is that the voltage getting to the computer from the MAF is too low. It could be a bad MAF, or bad wire between the MAF and the computer.

May 16, 2015 | 2007 Chevrolet HHR

1 Answer

Flashing enegine light runs rough


Sounds like engine misfire, have codes pulled, should indicate which cylinders are affected,

Dec 22, 2013 | 2006 Chevrolet HHR

1 Answer

Po303


code po303 refers to cylinder 3--misfire detected===causes --engine mechanical fault---wiring---ignition/ fuel system---injector---ECT/MAF sensor---ECM. check plug and HT lead to no 3 cylinder. Check that the injector to 3 cylinder is operational and not blocking or squirting. Have a compression test done to check for compression / gasket problems

Dec 14, 2013 | 2006 Chevrolet HHR

1 Answer

Chevy hhr starter location


Starter located on the engine, from under car look between engine and radiator, where engine connects to transmission, that is the starter. Check links below, press the helpful button
Chevy HHR starter location and removal

Going under the Chevy HHR

How to Test and Troubleshoot Starter Problem

Time to replace starter 07 HHR 2 4L Chevy HHR Network


Dec 03, 2012 | 2006 Chevrolet HHR

1 Answer

Random misfire and smoke coming out of tail pipe


could be a bad injector swap it with another cylinder

Oct 14, 2012 | 2008 Chevrolet HHR SS

2 Answers

Check engine light on


I have the same problem, have swapped coils, injectors, plugs and replaced plugs w/ new ac delco iridium plugs. I have flushed out the fuel rail 3 times and tried adding seafoam, iso heet and berryman's B-12 chemtool to the tank over the last 15- 20 tanks of gas. I have also wasted money and cleaned the mass air flow sensor. NOW I FEAR THAT THE CATALYTIC CONVERTER IS GOING BAD DUE TO THE MISFIRES! (smells like sulfer/rotten eggs at times.)There is a service bulletin for contaminates and water in the fuel. It states that the fuel rail is a non-return type. This means that any water or contaminates in the fuel will enter the rail and stay there inturn clogging the injectors. The bulletin states that this causes the misfire on cylinders 1 and 4 during right and lefthand turns. So why is it only P0304 and never P0301? The dealer will charge you 300.00 to flush the injector rail. The problem is compounded by the fact that there is no fuel filter on the HHR except the one in the tank. Evidently that is not good enough to keep contaminates from reaching the fuel rail. I am going to drop my fuel tank and drain all the fuel from the system and refill w/ top tier fuel from a top tier station. Search for top tier fuel on the web. If it comes back again, I am going to get a ford focus. I can't keep worrying about this nonsense. Too bad too because I really like my HHR. Reliability is more important to me now, after all this time and money.

Oct 20, 2008 | 2006 Chevrolet HHR

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