Exhaust 'popping' at idle and down-shifting. Also having Boost problems.
#1
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Exhaust 'popping' at idle and down-shifting. Also having Boost problems.
This started about 3 weeks ago.
Is this an indication that the gas is not beeing completely burnt? Could this be caused by bad Spark plugs (I changed them 6 weeks ago), or bad ignition wires (haven't changed them for 2 1/2 years - 30,000kms)?
How often should you change ignition wires?
I've also just had the main cat removed and got a straight pipe installed in it's place (can anyone say loud ), but the popping started before this. I've also had the pre-cat gutted (about 1 year ago).
I'm also having boost problems (this started about the same time as the exhaust popping). You can hear the boost, you can see the boost gauge go up, you just can't feel it. This happens most of the time, but occasionally, I do get proper boost. Any Ideas what this could be?
Is this an indication that the gas is not beeing completely burnt? Could this be caused by bad Spark plugs (I changed them 6 weeks ago), or bad ignition wires (haven't changed them for 2 1/2 years - 30,000kms)?
How often should you change ignition wires?
I've also just had the main cat removed and got a straight pipe installed in it's place (can anyone say loud ), but the popping started before this. I've also had the pre-cat gutted (about 1 year ago).
I'm also having boost problems (this started about the same time as the exhaust popping). You can hear the boost, you can see the boost gauge go up, you just can't feel it. This happens most of the time, but occasionally, I do get proper boost. Any Ideas what this could be?
#2
Senior Member
Join Date: Nov 2002
Location: Albany, New York
Posts: 355
Likes: 0
Received 0 Likes
on
0 Posts
Sounds like you need a fuel controller or hal tech.You are running too lean.But you will get a loud pooping noise after fixing the fuel system because of the lack of cats at wide open throttle and shifting.Thats because unburned combustion in the exhaust will ignite from building up.
#4
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by spunks
Sounds like you need a fuel controller or hal tech.You are running too lean.But you will get a loud pooping noise after fixing the fuel system because of the lack of cats at wide open throttle and shifting.Thats because unburned combustion in the exhaust will ignite from building up.
Sounds like you need a fuel controller or hal tech.You are running too lean.But you will get a loud pooping noise after fixing the fuel system because of the lack of cats at wide open throttle and shifting.Thats because unburned combustion in the exhaust will ignite from building up.
Anyone else?
Originally posted by darkwaveboi
sounds like he's running rich to me...not lean
sounds like he's running rich to me...not lean
#5
Despise Enmity
Join Date: May 2001
Location: Richmond, VA
Posts: 2,420
Likes: 0
Received 0 Likes
on
0 Posts
1. Are you relying on the stock gauge or an aftermarket?
2. How many miles on the turbo?
3. Do you have a blow off valve?
4. Have you checked your engines compression lately?
2. How many miles on the turbo?
3. Do you have a blow off valve?
4. Have you checked your engines compression lately?
#6
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Josepi
1. Are you relying on the stock gauge or an aftermarket?
2. How many miles on the turbo?
3. Do you have a blow off valve?
4. Have you checked your engines compression lately?
1. Are you relying on the stock gauge or an aftermarket?
2. How many miles on the turbo?
3. Do you have a blow off valve?
4. Have you checked your engines compression lately?
2) I have 133k KMS on the odometer. I don't race, and I've never pushed it very hard.
3) Everything under the hood is stock, so if it didn't come with one, I don't have it.
4) I had it checked about 10 months ago and was told it was good (but the ******** at Mazda never gave me any numbers).
Question... does the car need to be running for a proper compression check (at Mazda Dealer)? I mean it idles, but ummm... let's just say it's a little funky. (all vacuum hoses were replaced 6 months ago).
Trending Topics
#8
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by dr0x
Honestly, if they didnt give you the numbers Id be surprised if they actually did one.
Honestly, if they didnt give you the numbers Id be surprised if they actually did one.
Noone else has any thoughts??
#9
Senior Member
Join Date: Oct 2002
Location: brigham city utah
Posts: 310
Likes: 0
Received 0 Likes
on
0 Posts
try adjusting your throttle postion sensor and mess around with the rich/lean screw. helped on my car. by the way the popping on downshifting is normal for rotaries but it shouldn't reallyy do it at idle. have your engine codes checked also, the car might be running in safe mode for some reason
#10
10 lb. boost, 5lb. bag
iTrader: (1)
If you hear boost but don't feel boost, you might have a boost leak.
The stock gauge doesn't mean spit once you mod the car at all really, especially if you have a fuel cut defender.
Popping on decel is normal when you're running rich and have an open exhaust, it's a hair shy of shooting flames.
The stock gauge doesn't mean spit once you mod the car at all really, especially if you have a fuel cut defender.
Popping on decel is normal when you're running rich and have an open exhaust, it's a hair shy of shooting flames.
#11
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Gene
If you hear boost but don't feel boost, you might have a boost leak.
The stock gauge doesn't mean spit once you mod the car at all really, especially if you have a fuel cut defender.
Popping on decel is normal when you're running rich and have an open exhaust, it's a hair shy of shooting flames.
If you hear boost but don't feel boost, you might have a boost leak.
The stock gauge doesn't mean spit once you mod the car at all really, especially if you have a fuel cut defender.
Popping on decel is normal when you're running rich and have an open exhaust, it's a hair shy of shooting flames.
I will get a boost gauge, and I think I will also need to get an FCD.
#12
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by mac_dad6
try adjusting your throttle postion sensor and mess around with the rich/lean screw. helped on my car. by the way the popping on downshifting is normal for rotaries but it shouldn't reallyy do it at idle. have your engine codes checked also, the car might be running in safe mode for some reason
try adjusting your throttle postion sensor and mess around with the rich/lean screw. helped on my car. by the way the popping on downshifting is normal for rotaries but it shouldn't reallyy do it at idle. have your engine codes checked also, the car might be running in safe mode for some reason
#13
Passanger shock tower next to the boost sensor.
www.egauges.com has good priced gauges, maybe give them a look.
www.egauges.com has good priced gauges, maybe give them a look.
#14
Full Member
Join Date: Jul 2002
Location: Salt Lake City, Utah
Posts: 176
Likes: 0
Received 0 Likes
on
0 Posts
hmm.. be very carefull with the rich/lean screw.. Mark the factory position before messing with it.
get a can of brake cleaner or carb cleaner and look for vac/boost leaks.
Quesions:
What RPM is your idle set at?
Have you checked the TPS lately?
get a can of brake cleaner or carb cleaner and look for vac/boost leaks.
Quesions:
What RPM is your idle set at?
Have you checked the TPS lately?
#15
Rotary Freak
Join Date: Aug 2001
Location: Ottawa, Ontario
Posts: 2,788
Likes: 0
Received 0 Likes
on
0 Posts
Hey StarionX, if it helps, i have a 89 tII in ottawa too and i have the same shatty *** idle/popping crap as you. Minus the boost thing... i'm thinking that's because you're boosting before the car is fully warmed up. And i do mean FULLY. Because the ecu will be in the cold idle mode, and it will run like a bag of **** since its so damn rich.
Give me a shout, we can diagnose our **** together lol I already set my tps ... and re-checked it like 3 times (made sure the car was hot. In fact, burned myself trying to do it several times)
Good luck.
Give me a shout, we can diagnose our **** together lol I already set my tps ... and re-checked it like 3 times (made sure the car was hot. In fact, burned myself trying to do it several times)
Good luck.
#16
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by saltlakebay
hmm.. be very carefull with the rich/lean screw.. Mark the factory position before messing with it.
get a can of brake cleaner or carb cleaner and look for vac/boost leaks.
Quesions:
What RPM is your idle set at?
Have you checked the TPS lately?
hmm.. be very carefull with the rich/lean screw.. Mark the factory position before messing with it.
get a can of brake cleaner or carb cleaner and look for vac/boost leaks.
Quesions:
What RPM is your idle set at?
Have you checked the TPS lately?
TPS?? No, haven't quite gotten up the courage to tackle that. I'm waiting until this part of the world realises it is supposed to be spring, not winter!!
#17
Rotary Enthusiast
Thread Starter
Join Date: Jan 2002
Location: Australia
Posts: 823
Likes: 0
Received 0 Likes
on
0 Posts
Originally posted by Fingers
Hey StarionX, if it helps, i have a 89 tII in ottawa too and i have the same shatty *** idle/popping crap as you. Minus the boost thing... i'm thinking that's because you're boosting before the car is fully warmed up. And i do mean FULLY. Because the ecu will be in the cold idle mode, and it will run like a bag of **** since its so damn rich.
Give me a shout, we can diagnose our **** together lol I already set my tps ... and re-checked it like 3 times (made sure the car was hot. In fact, burned myself trying to do it several times)
Good luck.
Hey StarionX, if it helps, i have a 89 tII in ottawa too and i have the same shatty *** idle/popping crap as you. Minus the boost thing... i'm thinking that's because you're boosting before the car is fully warmed up. And i do mean FULLY. Because the ecu will be in the cold idle mode, and it will run like a bag of **** since its so damn rich.
Give me a shout, we can diagnose our **** together lol I already set my tps ... and re-checked it like 3 times (made sure the car was hot. In fact, burned myself trying to do it several times)
Good luck.
#18
Senior Member
Join Date: Jul 2001
Location: Queens, NY-----Rockland, NY(School)
Posts: 544
Likes: 0
Received 0 Likes
on
0 Posts
i have pretty much the same problems. I also have low idle sometimes too...
I know i need new plugs, but the overall problem can only be a few things...
TPS can be off, you(me) can have a vacuum leak or a boost leak somewhere, or you can be running too rich like myself.
But like someone said, be very careful playing with the rich/lean screw. BAD THINGS CAN HAPPEN WHEN YOU SET IT INCORRECTLY.
I also have a clogged cat i believe, and that can be screwing up the boost, as soon as i can, im going to get my highflow cat thats waiting for get welded in at home installed...along with a complete look over for any leaks and a tune up...Its only a matter of narrowing down the potential problems.
I know i need new plugs, but the overall problem can only be a few things...
TPS can be off, you(me) can have a vacuum leak or a boost leak somewhere, or you can be running too rich like myself.
But like someone said, be very careful playing with the rich/lean screw. BAD THINGS CAN HAPPEN WHEN YOU SET IT INCORRECTLY.
I also have a clogged cat i believe, and that can be screwing up the boost, as soon as i can, im going to get my highflow cat thats waiting for get welded in at home installed...along with a complete look over for any leaks and a tune up...Its only a matter of narrowing down the potential problems.
Thread
Thread Starter
Forum
Replies
Last Post
trickster
2nd Generation Specific (1986-1992)
25
07-01-23 04:40 PM