Hi guys again,
I cant find my other threads, I dunno were they are. I cant navigate the site really well so apologies in advance for yet another thread

Just de clogged my CAT as per some sound advice on here.

Fired her up, seems ok and good

but she wont rev above 5.5K - exactly the same as when a piston engine hit its limit, bounces on and off the limit if you get me??

Why would this be?

Do I need to do anything with the 02 sensor?
Also fuel light is on - does she just need fuel and time to stabilse??

Help would be good guys, rather worried

Thank you kindly

 

Year? Miles? Age of coils, wires, and plugs?

Need a lot more info to be able to help.

 

05 plate
96K
coils, plugs and leads changed 1000 miles ago

stock car.

Just and FYI - in my other thread that i cant find - I posted following symptoms

car low on powr at top end
1st and second gear ok
third and above, wont rev much over 6.5K (seem to be strangled)
odd deep throaty sound like when you used to jam a can on your back tyre as a kid
Also p0120 - throttle position sensor fault (Although the CEL for that has since gone off and codes cleared)

Reply on here said CAT was clogged.
Took it of, and >60% had fallen apart and was a mess
Beat it out, order high flow CAT (about 5 days delivery)
Sound has gone, but she wont go higher than 5.5K
Going to fuel her up now and will report back in a short while

any info helpfull pretty please

 

I'll be honest, my symptoms were identical to yours (however my Cat wasn't nearly as bad as you describes yours to be) and swapping in a catless midpipe (Agency Power, then a BHR) solved it immediately. I also have the BHR ignition system.

 

Problem!!

Will rev up now but:

De clogging the CAT has not solved it.

Still have a lack of power above 6K:
1st gear seems OK and I teased throttle up, she kinda jolted in 1st and hit 7.5K,
2nd and third she gets to 6k and there is like starving of something, accompanied by a click every so often.
I want to say sticky SSV????

I have no CEL and idle is fine.
Also when I rev her stationary she will go up to 8k.
After warmed up the engine does seem rough also.

Any one any ideas?
I am worried that something will go 'pop'

thanks guys

 

After a bit of reading,

In the thread 'power loss = me stumped' the symptoms extreamly similar to what I am having
with the addition of my weird noise - again like the sound of a tin can jammed on the back wheel of your bike when you were I kid

Having concluded that CAT is not the problem now, I think
Fuel pump
SSV (as if my reading is correct, kicks in at 6250rpm??)
02 sensor

I have limitied equipment so is there a way to test any of these components?

Or am i heading in the wrong direction completely?

Thanks guys

 

The only thing I can come up with that relates to why your car would act differently at 5,500 RPM vs below that is the "Warm Up Rev Limit" table in your PCM that limits your RPM to 5500 at certain engine loads(?) if your engine coolant temp is below 68f.

I don't mean to be sending you off on a wild goose chase, but are you letting the car warm up fully before testing to see if it'll go north of 5500 RPM? Do you have a code reader that will tell you what your engine coolant temperature (ECT) is? Your thermostat might be stuck open and you may never actually be hitting the proper coolant temp, even though your temperature gauge might be reading "warmed up."

This is just a wild stab in the dark here, I don't want to send you in the wrong direction.

 

tell me more about this de-clogging of the cat

 

In one of his other threads he gutted it. I'll be honest, I think he's posted 3 or 4 different threads about this topic, and right now it's confusing the crap out of me.

 

Hey man, yeah sorry. The other threads have gone - my up post apologies for starting a few threads however I have the one here now.

Yeah as you said I took the CAT off and lok inside. About the first 1/3rd had collaopsed and bit of it rattling about. so I emptied them out. The second third was very weak and bearly had to touch it for it to come out.

The final 1/3rd seemed good but it had to go - obviously.

I origonally reported a loss of power at the top end and a knock every so often.

I warmed her up, fueld her up and she will rev above 5.5k now but just has no guts above that.

Revs will climb but it knocks/ticks/ above 6K - thats when Im driving hard, >90% throttle

If I tease the speed up and wokr the gear box keeping revs below 5K I can get the speed up to around 85pmh in 6th and cruise.

Problem is accompanined by this 'tin can on back wheel noise' but has since reduced now the CAT is empty.

As I say it feels like she is sucking tons of air, (induction noise is lound even thought its stock intake) but that somthing is missing.

I have researched all sorts:

SSV
TB
02 sensores.

The latter being my first option as to replace front / rear 02 sensors is not too bad butI really dont know if this is the issues.

I have acces to my freinds data logger, thought it is a broard one. Hooked it up last week and every came up clear, even said the CAT test was OK.

As I say had a P0120 code but has since cleared itself.

Everything gets worse as she gets warmer.

I love the Car but despite my care and attention if she may have to go and replace with something bit more reliable - help me before I get rid and regret it.

This is dissapointing as im an aero space engineer and play around $40 million engines / desing blades etc no problem - but the wankel engine scares the crap ouot of me.

Thanks people and again sorry for the thread problem

 

clogged catback?
Just random thought.
This happened to few people before.

 

More INFO -

Trip to work this morning - I kept her below 5.5k at all times. She sounds and feels good at lower rpms - except this dam noise - under load you can hear the noise i have described, most prominent and second and third.

When I give >60% throttle and put the clucth in (i.e the engine will 'sppol' down) the noise sounds like a dump valve on a turbo'd car - but again its this tin can on back wheel noise.

Its like there is some pressure that is relieved when Iput the lucth in.

its not as bad in 4th and 5th.

Got to work, in to enatural, and stationary. and using 30% throttle she revved all the way up, with a tiny 'cough' at exactly 6k
using 50% throttle seemed to go all the way up with no issues.

I did notice she is idling at 900 - 1000rpm -which while is smooth, she has always idled at 800rpm.

I will do another driving cycle or two keeping her below 5K and then try and take he rup again, see whats what.

Any one want to chime in at this point as im a bit stuck now. HAHA!

Thanks

 

Erm didnt think of this and certainyl somthing I can look at.
Not sure when ill be able to though as work take most of my time through the week and I fly to Seattle at the weekend.

Any one in seattle I can bug next week about? lol?

Would clogged CAT back cause the sound im reffering to - or potentially.

Will also try and speak to a mazda mechanic at some point today.

 

I just took care of this exact same issue this weekend. However, i would recommend checking the following:

SSV - P2070 code will be seen but not always. Try checking it by manually moving the lever with a long screw driver, this should always be easy to move in and out by hand. I believe there is a thread that explains how to analyze it.

If the CAT is clogged, you might be able to tell if you take it for a ride and just try putting some load on the engine and the CAT should glow from the heat. This is something that happen to me as well and got it addressed by getting a RP....

However, this past weekend i was experiencing the same issue that you're describing for quite some time and after searching the forums here i figured out that my engine was staving for fuel.

Symptoms:

-Lots of lack of power while climbing hills
-Issue was more noticeable after driving it for a long time
-Engine was making horrible noises when going over 5k while cruising on 6th gear.
-ODB2 analyzer tool was giving me good readings on sensors and throttle body was opening just fine
-Issue was more noticeable on warm days.

Yesterday, I decided to buy a new fuel pump (Airtex) with OEM Arram pump which i purchased from Autozone and Shazzam!

After 2 months of messing around with it i was able to address it. I was able to take it for a nice run like never before!

I will give credit to Charles Ray since he help me out a few times while i got stuck in the installation process.

Hope this helps!

 

I also had that P0120 code at some point when the RPM went a little higher on me due to the lack of fuel... who knows...
I cleared it out and it came back again but this was before i replaced the pump!

 

Climber, forgive me if I missed this, but you completely gutted the cat, correct? Or did you just dump out the loose material you could reach?

 

I feel that I am having the same thing, a lack of fuel.
Do I do the fuel pump or llook esle were first?

Thanks for the input

 

rickeo,

completely gutted, CAT is essentially just a baffle now.

Absolutly nothing inside if now.

Whats your thoughts?

Thanks man!

 

You can take it to a mechanic for them to do a quick fuel pressure check for them to review which i believe should be at 60 Psi. I didn't do any of these since the symptoms i had were clearly fuel pump overheating related. What's really going to throw you off are the noises it makes at high RPM which i now know that are due to fuel starvation.

I started buy purchasing the motor fuel pump and re-using the stock assembly but as soon as i carefully released the fuel line it cracked the intake nipple without me noticing it.

Then i moved to getting the motor pump installed which as a big pain to take those stiff hoses off.

Clean the assembly and filters.

Attach new hoses with clamps.

When i replaced the pump back in the tank i had a nasty leak which made me believe it was the line...

Went to the stealership and got a new fuel line (80 DLLS) and got that replaced.

Still Leaking! FML...

Went to autozone and got a Airtex pump which it actually includes the exact same pump made by Arram that you would see on the stock assembly.

Installed that sucker in and that was it. The weather here in Arizona is starting to heat up and i didn't need any highway travel for the issue to be noticeable. I then took my 8 for a run and felt just like new!

Long story short "Buy an Airtex fuel pump and be real careful while releasing the fuel line"

 

Hi guys,

so but of an update I have noticed the following

When she is cold (not stone dead cold but still warming up) there doesnt seem to be a power drop off
The sound is also minimal when she is cooler than normal running temp
When she is warm somtimes the power loss is quite bad sometimes not.
Power loss is at 6k rpm
The noise I have been describing is directly related to the amount of throttle i use - I.e if I use 1/4 throttle and let the engine work its way up, when the clutch goes in there is minimal 'spoil down with the growly noise' When i use >50% throttle it is very loud
When she warms up properly both noise and power loss are present.

What can expand under heat that can cause power loss and what the hell is this dam noise??

Fuel pump may be, but that doesnt explain the noise?
Sticky outlet into exhaust and after I let the throttle go engine is still pushing gas out???

Am struggling guys, and one want to dive in at this point??

Thanks kindly.

FYI I am in washington next week so will be more close to forums time zone.

Cheers

 

Is the noise something like this:
Mine didn't have any issues when it was cold... when warm, i did experience the power loss altogether with the noise from this video which doesn't explain what the fix was. However, replacing pump was my fix.

Maybe on the video it doesn't sound as loud but on my scenario it was the exact same noise but way louder.

 

Over 9K, unfortunatly not. i think I can hear the sound you are having and mine is not like that.

I have just completed an 80 mile trip on the highway. she will sit at anythingup to 5.5 K in any gear with no issues.

There is always this grumble / tiun can sound from the engine. i have determined it is directly related to the amount of throttle I use as said previously.

I cruised most of the way only giving it some every now and then. some times she went all the way up with no power loss, somtimes with power loss, some times (after about 50 miles or so) I never took her above 6k as at that point i got a new sound -

Iduction noise was LOUD!!!! more so than normal and kind of a tap / rattle that felt like she was stammering?

Really stuck now guys, it may have to be in to the garage when im back from my travels.

Ill try and record the noise and get it on here see if anyone can shed any light on it.

 

If its making can noises and your cat was in pieces.....could it be that your muffler is clogged with large chunks of cat debris??? I had that...so essentially your exhaust is still clogged. Or the can noise is broken engine seals as well...when i broke an apex seal thats what it sounded like.

 

im having the same problem but mine wont rev above 7-8rpm..i figured it was the cat because when i turn off the car i can hear something like rocks flying around in the exhaust/cat..but it doesnt do it all the time..i also need to replace the o2 sensor..the front one

 

Both these make sence. I will take a look at the muffler.

Apex seals are bad and is engine rebuild right???

Noise is coming from left hand side of engine bay ( i think)

It seems like there is pressure from somthing building and being released but sounds like a blow and it 'spools down' as the pressure is released.

This is just a description of the sound, dont actually know if there is pressure of anything etc.