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Showing results for tags 'misfires'.
Hello. Great site. I recently purchased a 04 996 AE with 113K. My OBD showed random misfires. I checked the plugs and coils. Coils were cracked so I replaced all plugs and coils. The plug condition was consistent across all cylinders... ash gray color and no pitting or carbon or oily plugs. The misfire codes returned and I noticed the idle is rough but the engine pulls and is smooth off idle and through the rev range. I purchase the Durametric and I ran actual values (codes showed random misfires across most cylinders) the check engine light came on at one point but had gone away on it's one while waiting for my cable to arrive. My problem is I have lots of data to look at but no way to understand or to translate it into actionable information. I am not even sure that I captured the right parameters for my misfire error codes. Is there a good place to look at what the actual values should be for a 996? or a link to any tutorials on how to read the data and translate that into a what to check or troubleshoot? Any advice would be greatly appreciated and thoroughly utilized.
I took it to the shop and the car shows those system too lean in bank 1 and bank 2, do i have to replace anything? The mechanic told me we should replace the coils in #4 and #5 because they are misfiring due to something. Any ideas before i go buying new coils?
Hi there folks, I’m having some random misfires in my ’03 Boxster. I’ve disassembled the intake manifold to get a better understanding of the problem, and as per the picture below, there is clearly something going on with cylinder-1. a week ago, CEL came on for random misfires in cylinder-1 (P0301) Engine runs well, has high millage (320km) and no noticeable degradation in performance Checked the coolant, and was below the minimum mark (which was flushed a couple of months ago) On the exhaust side, there are dripping marks, probably coolant leaking through the exhaust manifold gasket (!) All this makes me think that it’s leaking coolant through the head gasket into cylinder-1. I already know this is not a four-hour repair to be completed during a weekend, and that one way or another, the engine will have to come down for surgery. . so I'll definitively appreciate any inputs! Thanks, Jones.
Heavy rain all day and car misfired - better now since things dried out but the CEL codes that are in the ECU currently are P0300 Random/Multiple Misfire. P0301 Cylinder 1 Misfire and P0303 Cylinder 3 Misfire. The technician checked readings from the Mass Air Flow sensor and Oxygen Sensors during his diagnostics and takes that in account. If the Mass Air Flow was not with in spec. then that would point to some thing wrong with that sensor. Those readings were accurate. Shop wants 1000 for new plugs, coils - seems in line with what other paid but no guarantee that will fix it according to tech. Given rain I assume coils are bad but we shall see....