P0300, P0303, Loud noise when in gear?
Thread Starter
Member
Joined: Mar 2004
Posts: 230
Likes: 0
From: Grapevine, Texas
2004 Capri Blue C32
P0300, P0303, Loud noise when in gear?
Hey everyone,
I haven't posted in a long time, because frankly I haven't been having problems. Now I have what I hope isn't a big one.
2004 C2, 125k miles. Lately I have had the power loss when it warms up on the highway. I've had it before and it's been the intercooler one time, and the pump another time. I thought this time was the intercooler, so I took it to MB for a checkup. They did the pressure test and pump test and told me it was the pump. Rather than pay them $1075 for the repair (seriously), I bought the pump from Needswings. I also had an old battery that wasn't starting in this Chicago weather, so I replaced it last week.
Today, it's 5 degrees and freezing cold. I go to move the car, start it up, and hear a loud clanking sound. After warmup, there's a rough idle, but no noise - until I put it in gear. Then it's noisy. Check engine light comes on, and I get the codes: P0300 and P0303. I understand the codes and will check the plugs/wires/etc., but I'm REALLY concerned about the sound when I put it in gear. It's not just a rough idle, but an engine noise.
Anyone have this problem before? Any ideas? Is the engine blown? I would love to only need new plugs and/or wires, but this one worries me.
Thanks for your thoughts!
I haven't posted in a long time, because frankly I haven't been having problems. Now I have what I hope isn't a big one.
2004 C2, 125k miles. Lately I have had the power loss when it warms up on the highway. I've had it before and it's been the intercooler one time, and the pump another time. I thought this time was the intercooler, so I took it to MB for a checkup. They did the pressure test and pump test and told me it was the pump. Rather than pay them $1075 for the repair (seriously), I bought the pump from Needswings. I also had an old battery that wasn't starting in this Chicago weather, so I replaced it last week.
Today, it's 5 degrees and freezing cold. I go to move the car, start it up, and hear a loud clanking sound. After warmup, there's a rough idle, but no noise - until I put it in gear. Then it's noisy. Check engine light comes on, and I get the codes: P0300 and P0303. I understand the codes and will check the plugs/wires/etc., but I'm REALLY concerned about the sound when I put it in gear. It's not just a rough idle, but an engine noise.
Anyone have this problem before? Any ideas? Is the engine blown? I would love to only need new plugs and/or wires, but this one worries me.
Thanks for your thoughts!
Thread Starter
Member
Joined: Mar 2004
Posts: 230
Likes: 0
From: Grapevine, Texas
2004 Capri Blue C32
Update......
Well, I talked to a couple of people, and tried resetting the computer. I disconnected the negative battery lead for about 25 minutes, plugged it in, and still had the problem. I plugged in my code reader to check the codes and had the same P0300 and P0303. While it was running, I felt it smooth out, so I tried putting it in gear. No more noise, no more rough engine. Skeptical, I cleared the codes, shut it off, and tried again. No more codes, no more rough idle, no more noise. Car runs fine now. WTF?!?!
Happy, but still skeptical.........
Happy, but still skeptical.........
