Hey guys, been a long time since I've been on here, but I've been having some issues with my 8 and I was hoping to get some of your ideas.
2006 RX8, MT, 81k miles (purchased at 33k miles, I have never tracked the car). Short block replaced at 5k miles.
A little backstory:
About every 15-20k miles I would have an issue with my car starting to run rough and I'd take it to the dealer and they would replace the coils (I know to avoid the dealership now, but I didn't then). The last time this happened, the dealership said they replaced the plugs, but it was still running rough. The dealer that I normally went to closed down, so I went to one a few more miles away, they did a compression test and I was getting high 7's, low 8's. Here is where I can't be 100% because I never got any paperwork with this information, just some scribbles on the back of a sheet of paper and they didn't charge me for it.
On a recommendation from someone in socal, I went to Neptune Speed to have it looked at. They told me they weren't really sure what was wrong, but my sparkplugs didn't look new, so they replaced them and the car ran much better, but not quite 100%. They also told me my fuel injectors needed to be pulled out and sent off to be cleaned. I wanted to verify this before spending the 600-800 they wanted to charge me, but I haven't done that yet.
Ended up taking it to another mechanic who looked for vacuum leaks and did some other maintenance for me. He said he checked the plugs and replaced the plug wiring, which was the wrong harness for my car, so it was rubbing up against the block. While he was in there he checked the plugs and said they were fine.
So last night I bough new plugs and coils to install myself. Got home and replaced all the coils (the ones in the car looked fine, but I figured it couldn't hurt). Making sure I had the right tools I checked the plugs with the socket I had and found out pepboys sold me 4 completely rusted and used plugs, so I have to take them back today. The previous mechanic did check them less than 1500 miles ago when he replaced the wires, so I don't think they need replacing.
In any case, the issue persisted after I replaced the coils. Basically the car runs terrible at low rpms, and feels like its going to stall, especially when going uphill, until I run the car for about 10-15 minutes and then it runs better, but not well. Still sounds like its having a hard time chugging along like its miss firing (I can almost consistently get a P0301 code when I redline in 3rd gear). I plan on replacing the spark plugs anyway, just to make sure that's not the issue, but I'm afraid its the apex seals. Do they expand after warming up, so I would experience low compression until the car heats up and then I would have slightly better compression? Please excuse any ignorance, I just started getting comfortable enough to start doing some of my own repairs (which btw, was really fun!).
I'd love to hear everyone's thoughts on what could be going on and I'm happy to answer any questions.
If anyone is in the Southern Orange County area and wants to feel out the car, let me know.
2006 RX8, MT, 81k miles (purchased at 33k miles, I have never tracked the car). Short block replaced at 5k miles.
A little backstory:
About every 15-20k miles I would have an issue with my car starting to run rough and I'd take it to the dealer and they would replace the coils (I know to avoid the dealership now, but I didn't then). The last time this happened, the dealership said they replaced the plugs, but it was still running rough. The dealer that I normally went to closed down, so I went to one a few more miles away, they did a compression test and I was getting high 7's, low 8's. Here is where I can't be 100% because I never got any paperwork with this information, just some scribbles on the back of a sheet of paper and they didn't charge me for it.
On a recommendation from someone in socal, I went to Neptune Speed to have it looked at. They told me they weren't really sure what was wrong, but my sparkplugs didn't look new, so they replaced them and the car ran much better, but not quite 100%. They also told me my fuel injectors needed to be pulled out and sent off to be cleaned. I wanted to verify this before spending the 600-800 they wanted to charge me, but I haven't done that yet.
Ended up taking it to another mechanic who looked for vacuum leaks and did some other maintenance for me. He said he checked the plugs and replaced the plug wiring, which was the wrong harness for my car, so it was rubbing up against the block. While he was in there he checked the plugs and said they were fine.
So last night I bough new plugs and coils to install myself. Got home and replaced all the coils (the ones in the car looked fine, but I figured it couldn't hurt). Making sure I had the right tools I checked the plugs with the socket I had and found out pepboys sold me 4 completely rusted and used plugs, so I have to take them back today. The previous mechanic did check them less than 1500 miles ago when he replaced the wires, so I don't think they need replacing.
In any case, the issue persisted after I replaced the coils. Basically the car runs terrible at low rpms, and feels like its going to stall, especially when going uphill, until I run the car for about 10-15 minutes and then it runs better, but not well. Still sounds like its having a hard time chugging along like its miss firing (I can almost consistently get a P0301 code when I redline in 3rd gear). I plan on replacing the spark plugs anyway, just to make sure that's not the issue, but I'm afraid its the apex seals. Do they expand after warming up, so I would experience low compression until the car heats up and then I would have slightly better compression? Please excuse any ignorance, I just started getting comfortable enough to start doing some of my own repairs (which btw, was really fun!).
I'd love to hear everyone's thoughts on what could be going on and I'm happy to answer any questions.
If anyone is in the Southern Orange County area and wants to feel out the car, let me know.
2006 Running rough, feels like its missing, gets slightly better when warmed up
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