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Misfiring on '05 PT Cruiser GT

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Old 06 Sep 2016, 05:37 pm
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Exclamation Misfiring on '05 PT Cruiser GT

Hey guys,

Recently my PT Cruiser GT has been misfiring. I've already fixed the issue once but it has since returned. Last week it started to act up only under boost and slowly turned into misfiring at idle and backfiring on startup. On the way to diagnosing the issue I found out the last guy to work on the car JB welded a vacuum line onto the intake. So I drilled out the hole that was left and tapped it was 1/8" NPT thread and stuck a 1/8" NPT to 3/8" barb in there with some thread sealant and hose clamped the line on. I also changed out the spark plugs and ignition coil and plugs with one from the junkyard off of another GT Pic1 Pic2. For 90% of the time it never through a code, I had to throw it in 2nd gear and floor it up a 15 degree incline hill at full throttle for a code to stick. It gave me a p0300, multiple misfires on multiple cylinders, so I figured it was ignition.

That fixed the issue! Ever since I did that it has been idling WAY smoother. However it seems like it never hit 12.5psi of boost any more, not sure what was up with that.

Now it's a week later and it has started back up today. Not sure why! I don't want to just start throwing more parts back at it as the coil cost me $40. Plus it's just a general pain to get to the ignition system on these cars.

On a maybe related note, the cassette player in the car is VERY staticy and the radio is slightly too, maybe a ground issue that is also burning up coils? Not sure.

What do you guys think?
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Old 06 Sep 2016, 10:13 pm
_PTGT03's Avatar
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Join Date: Oct 2015
Location: Abbotsford, British Columbia.
Posts: 797
Default Re: Misfiring on '05 PT Cruiser GT

it's a pressure loss in the intake system . this explains your engine misfire and inability to hold above a certain amount of boost and poor performance . you can take a shop vacuum and set it up so that it is in reverse and you can hook up your pipes to the the inlet piping around the air intake exchanger near the bottom of the car and with a rag stuck in the exhaust pipe and a bottle of soapy water and a listening ear you can pressurize the intake system with the shop vac spray down the entire intake manifold and piping with soapy water and also make sure to get in between the intake manifold upper and lower sections one that connects the two pieces together in the other section is where it connects to the engine had more likely than not you will find that there is a pressure loss towards the engine head you would have to take off the intake manifold And change the gasket .
good luck
2003 GT M/T in Onyx Green Pearl on Michelin Pilot Sport AS 3 Plus Tires 205/50ZR17. Dark Slate Gray Interior. OEM cargo net, parcel shelf, slush mats and trunk protector, mud flaps, mopar subwoofer. Platinum edition pedals, Neon SX 2.0 steering wheel with black+grey wrapped leather cover. Generic lowering springs, KYB gas shocks, Valeo solid flywheel conversion and clutch kit. Urethane insert engine mounts. Energy suspension full body urethane bushing kit. Chrysler premium front speakers, Jenson 6x9 rears. Boston Audio 4x55W amp. Panasonic head unit with xtenzi bluetooth. 300W AC power inverter. Escort 360max and Escort Shifter ZR4, dual front+rear dash camera. stage 1 blow off valve and syked tune computer . Boost and oil pressure gauges with Turbo-Timer. Needswings 3" exhaust elbow, Electric valve actuated Y-pipe with catalytic converter. To do: coilovers, 2step controller, quaife diff, Air-Fuel Meter
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2005, gt cruiser, ignition, misfiring, turbo

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