P0089 and P0304 plus no start condition - Chevy HHR Network


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Old 06-23-2017, 09:03 PM   #1  
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P0089 and P0304 plus no start condition

Im back with a new issue. I went out to dinner with my family tonight, the car ran fine on the way there. We made it about a mile down the road after eating and the car was hunting at idle, no codes though. Went another mile down the road and it started stumbling and threw a CEL. Major power loss and I was just barely able to get it into a parking lot and shut it down. My aerofroce gauge showed P0089 and P0304. Most of the misfires (300+) are reported on cylinder 4, cylinder three was showing in the 150 misfire range. Cylinders 1 and 2 were okay. I tried to restart the car at this point to see if the condition was temporary, but as soon as it started it ran like crap so I shut it off. Subsequent restart attempts only give cranking with and no firing.

The aerofrce gauge is showing about 60-70 psi on the high pressure side with the engine cranking so I assume the LP pump is working okay.

It looks like my HP pump is toast from what I've read in previous threads. Anything else I can do to diagnose this before I drop $300-500?
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Old 06-23-2017, 09:32 PM   #2  
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For the P0089, I see fuel pressure regulator and possibly wiring issues, so check those connections.
Ground wires are always a possibility

https://www.chevyhhr.net/forums/how-...cations-56504/

The P0304 misfire can be checked by moving the coil to #2 cylinder and the #2 to #4.
But that can be done after the fuel regulator issues are dealt with
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Old 06-23-2017, 11:26 PM   #3  
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you could get a fuel pressure gauge and hook it up.
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Old 06-29-2017, 07:10 PM   #4  
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I was out of town on business this week, but I ordered a new high pressure fuel pump from ZZP for $200 and put it in tonight when I got home. The good news is that the car started up okay so the high pressure pump solved that problem.

The bad news is that I now have a new problem. Smoke. Lots of white smoke coming from the tailpipe. The smoke is fuel or oil related judging by the smell of it. It's also misfiring like crazy as you might expect.
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Old 06-29-2017, 08:55 PM   #5  
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Sound to me like head gasket. How's the coolant level? That's what makes white smoke. Fuel is black, oil is blue.
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Old 06-29-2017, 09:32 PM   #6  
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With the previous P0304 code, you should pull the plugs and see if #4 is showing signs of burning coolant.
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Old 06-30-2017, 08:26 AM   #7  
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I don't think its the head gasket (at least I hope not). The car has been fine since the previous overheating issue and ran well up until the last five minutes before the HPFP died on me.

When I get home tonight I'm going to pull the new pump off and check to make sure it was installed right, but I can't imagine that the install was bad since it was only two bolts and two fuel lines and it only fits one way. While I'm in there I'll pull the plugs again and check their condition and run another compression test. I don't think I'll see signs of coolant being burned as the car has only run at idle for 5 minutes since the repair last night. Unless there's coolant in the cylinder or the plugs are wet I don't think I'll be able to tell.

What I'm worried about is whether the HPFP failure caused fuel to leak into the oil and dilute it to the point where it wasn't lubricating right resulting in blown rings or some other major damage. I definitely smelled gas near the HPFP before removing the old unit last night, but the cam follower bore was well oiled and not washed clean as I've seen reported to happen when they leak gas into the head due to failure.

This car is killing me. Between the dead radiator fan that led to the overheat incident 5-6 weeks ago and this issue I'm afraid I'm looking at some killer repair costs on stuff I'm not equipped to do myself. It's going to be hard to justify spending $5k on engine replacement when the car isn't worth much more than that ($7-8k maybe?).
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Old 06-30-2017, 09:42 AM   #8  
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You could check your oil level and sniff it.

Water is white, fuel is black, oil is blue.

Head gasket does not cost near $5000. Used engine nowhere near that.

These days $5000 for a new engine and all of the suspension fixed for around $1000; you have a new car for another 10 years. The body and electronics should last forever, barring accidents.
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Old 06-30-2017, 09:45 AM   #9  
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Head gasket, white smoke! Been there
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Old 07-01-2017, 08:19 AM   #10  
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where are you in NC ?
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