Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [random-misfire]

17 questions
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Can lack of oil cause P0300 Random Misfire?

I get OBD code P0300 Random Misfire (and no other error codes) on a very poorly maintained car. I changed the valve cover (whose spark plug well gaskets were degraded) and spark plugs, but the engine sounds the same, like only half the cylinders are…
Geremia
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Help identifying misfire conditon on 1998 Honda Civic DX

I'm struggling to identify the cause of a misfire condition in my 1998 Honda Civic. It has D16Y7 engine with 185,000 miles on it. The spark plugs, wires, distributor cap, rotor, and ignition coil were all replaced a year ago when a different misfire…
Robert Stiffler
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Any insights or tips on 2012 Mini Cooper S Coupe Random Misfires?

UPDATES 2: I ended up changing the HPFP which I got from eBay for half, the ignition coils, oil filter, air filter, spark plugs, and I put in the bypass for the faulty airbag sensor (all thanks to Youtube University - YTU). I am still getting p0087…
Tommie C.
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Purpose of camshaft position sensor (CMP) vs crankshaft position sensor (CKP) without VVT

On a vehicle with variable valve timing (VVT), the need for a camshaft position sensor (CMP) is obvious. However, on an older engine without VVT, what purpose does the CMP serve? The position of the cam vs crank is fixed, so it seems redundant to…
masospaghetti
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1 answer

Diagnosing silent misfires

2003 Honda Civic EX (~230,000 miles) has been giving me misfire codes for a while, mostly on cylinders 2 & 3, but sometimes 4. P0300 Random cylinder P0302 Cylinder 2 P0303 Cylinder 3 P0304 Cylinder 4 Took it to mechanic and they couldn't figure…
endolith
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06 Sienna 3.3 has irritating random misfired, but no light

How can one go about troubleshooting occasional missing when no light or code is generated? This Sienna has 155k, and hasn't ever had a formal tune up, just good oil and air maintenance. The 3 rear plugs have never been out as they are a royal…
Ed Yancy
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99 Camry, suddenly started not accelerating

My 99 Camry V6 suddenly (like 10 minutes after a normal drive) started having issues accelerating. If i am in park i can rev it and is fine up to 5000 rpm, but in drive, it now hesitates to accelerate normally. When i try, I also hear a fluttering…
cde
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how long does it take to erase OBD codes after unplugging the battery

I have been dealing with Engine Misfire codes (P0300 to P0304) on my 2003 Toyota MR2 Spyder. I changed the spark plugs and engine coils. That did not clear the codes. I used OBD scanner to erase the codes but every time I did, P0300 to P0304 kept…
Asdfg
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Intermittant Misfire Disagnosis - Plenum remove

I have a Mazda CX-9 SUV 2008, 3.7L engine version - just turned 300,000 KM. The CEL come on recently and the code pointed to the VVT solenoid on bank 2. There was also a misfire on Cylinder 2. I Ohm test both VVT solenoids and the one on bank 2 was…
Chris
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Intermittent overheating and P0300 at high rpm

I'm hoping someone might have some insight as to what's going on here. https://youtu.be/rhZzZZyLbd4 This is a friend's 2001 Xterra that came in with an intermittent overheating issue. While trying to replicate the overheating issue I noticed that a…
David Scheiber
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2002 Silverado 5.3 random misfire

I have an 02 Chevy Silverado 1500 4x4 with the 5.3 getting the po300 random misfire code. It idles great and drives fine if I baby it but as soon as it gets any load on it it starts to miss. I have done new plugs/wires, knock sensors, cam position…
Kevin Amsden
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12 volvo s60 t6 starting to misfire once upto temp

Please help! I have a 2012 Volvo s60 t6. I found the car misfiring #2. I looked and found a ripped PCV diaphragm. Replaced and car ran fine for 4 days. Today driving it up to temp and started misfiring again. Only seems to happen once warm. Plugs…
Jeremiah Lear
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MAF and MAP location

I have a 2000 Pontiac sunfire se 2.2 I’m having trouble locating the MAP and MAF sensors. The mechanic I took it to said he can’t work on my car cause it didn’t stall enough while driving my car.. told me catalytic converter, plugs and wires, o2…
Christie Holstein
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ECU problem Daihatsu Sirron M3 1.0

Daihatsu Sirion M3 1.0 Petrol Engine misfire and 3 random cylinder not working. Coil is working, but not checked the injectors. I bought an identical ECU on eBay, but not working.
Darsha Seneviratne
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troubleshooting Cylinder 2 misfire on Toyota MR2 Spyder

I am dealing with Cylinder Misfire p0300/P0302/P0304 codes on my Toyota MR2 Spyder and trying to get to the bottom of the issue. Here is what I have tried so far: Changed all 4 Spark plugs Changed all 4 Ignition Coils Checked wiring that goes into…
Asdfg
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