backfire popping coming from exhaust

fvillota · 04-06-2009, 09:51 AM

hey guys how are you.
as some may know my car has high idle and i cant figure out why. i managed to clean out the air control valve and it went down to like 1100 and now its back to 1500 and bouncing. it goes up and down up and down.
i do notice its running really bad and weak and i have what seems to sound like a back fire! i have these popping noises coming from the exhaust. is this normal? what is wrong with my car?

fvillota · 04-06-2009, 11:54 PM

anyone want to help me out?

Everett · 04-07-2009, 01:45 AM

Invest in a Genuine Toyota Engine manual. It has tons of stuff for troubleshooting. Mine is out in my garage or I'd scan a copy of the page on exhaust popping.

Gairloch · 04-07-2009, 01:55 AM

Or ...

1991 mr2 repair manual

fvillota · 04-07-2009, 09:02 AM

thanks

fvillota · 04-07-2009, 09:03 AM

link dosent work for me. tells it cannot be displayed!

JadeDragon · 04-08-2009, 01:16 PM

Maybe a timing or exhaust issue? Are you running an aftermarket exhaust? I think sometimes when you let off the gas a little fuel goes in the exhaust and burns there causing that popping sound.

fvillota · 04-08-2009, 03:24 PM

im running headers with no car and the rest is stock.
am i able to check timing at 2k rpm?

GINA2MR2 · 04-19-2009, 09:41 PM

i had this problem
i can explain the process to you. would be hella easier over the phone then to type. I have 3 broken fingers on my left hand (damn dodge motors) they got crushed pullin a motor.
pm me if you would like me to go through the process with you..

fvillota · 04-19-2009, 10:14 PM

hhaha pm sent.

PHOENIX · 04-19-2009, 11:17 PM

So you have bouncing idle?

(sorry, im confused by the title and the conversation)

fvillota · 04-19-2009, 11:31 PM

well now it dosent bounce any more. its a little high but i can hear my exhaust popping.
i only have headers and im not running with a cat.
never done that.

PHOENIX · 04-19-2009, 11:38 PM

k....just so you know, idle surge (bouncing) is 90% of the time cause by a leak in the intake system.

Don't know much about the popping except it could be a fuel/air issue. Usually too much air going into the engine. The pops is excess fuel exploding from poor combustion. Could be you need new spark plugs or you do have a bad air/fuel ratio by excess air.

I wouldn't be surprised if you have an intake problem....IE vacuum leak, dirty throttle butterfly, throttle body sensor.

fvillota · 04-19-2009, 11:41 PM

i'll check that out. you happen to know where i can get egr block off plates i want to take all the egr crap outta my engine.
and yea i might have a leak i guess cause the wire and sparks are new.

04-06-2009, 09:51 AM	#1 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	backfire popping coming from exhaust hey guys how are you. as some may know my car has high idle and i cant figure out why. i managed to clean out the air control valve and it went down to like 1100 and now its back to 1500 and bouncing. it goes up and down up and down. i do notice its running really bad and weak and i have what seems to sound like a back fire! i have these popping noises coming from the exhaust. is this normal? what is wrong with my car?

04-07-2009, 01:55 AM	#4 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 4,854 Thanks: 125 Thanked 258 Times in 228 Posts My Google Map iTrader Rating: (7/100% )	Or ... 1991 mr2 repair manual __________________ "Inside the car, the world beyond the driver's immediate horizon ceases to exist. Alone with the solitude of his desire, survival sense numbed by the speed, he's outrun the mediocrity of the outside world, slipped the shackles it tries to clamp on us all. He is running free, chased only by a fear of failure, for failure is to risk ejection into the real world." ~Mark Hughes

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04-06-2009, 11:54 PM	#2 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	anyone want to help me out?

04-07-2009, 01:45 AM	#3 (permalink)
Everett Lovin' the curves! Join Date: Aug 2006 Location: Decatur,IL/Solomons,MD Posts: 1,422 Thanks: 42 Thanked 59 Times in 55 Posts My Google Map iTrader Rating: (7/100% )	Invest in a Genuine Toyota Engine manual. It has tons of stuff for troubleshooting. Mine is out in my garage or I'd scan a copy of the page on exhaust popping.

04-07-2009, 09:02 AM	#5 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	thanks

04-07-2009, 09:03 AM	#6 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	link dosent work for me. tells it cannot be displayed!

04-08-2009, 01:16 PM	#7 (permalink)
JadeDragon Some Skills Join Date: Jul 2008 Location: Minneapolis, MN Posts: 76 Thanks: 7 Thanked 3 Times in 3 Posts My Google Map iTrader Rating: (2/100% )	Maybe a timing or exhaust issue? Are you running an aftermarket exhaust? I think sometimes when you let off the gas a little fuel goes in the exhaust and burns there causing that popping sound.

04-08-2009, 03:24 PM	#8 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	im running headers with no car and the rest is stock. am i able to check timing at 2k rpm?

04-19-2009, 09:41 PM	#9 (permalink)
GINA2MR2 Not A VR6 Join Date: Dec 2007 Location: J-Town Posts: 329 Thanks: 3 Thanked 7 Times in 7 Posts iTrader Rating: (0/0% )	i had this problem i can explain the process to you. would be hella easier over the phone then to type. I have 3 broken fingers on my left hand (damn dodge motors) they got crushed pullin a motor. pm me if you would like me to go through the process with you..

04-19-2009, 10:14 PM	#10 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	hhaha pm sent.

04-19-2009, 11:17 PM	#11 (permalink)
PHOENIX Beams Owners Group Join Date: Mar 2005 Location: On Hiatus....... Posts: 7,915 Thanks: 84 Thanked 260 Times in 197 Posts Blog Entries: 1 My Google Map iTrader Rating: (46/100% )	So you have bouncing idle? (sorry, im confused by the title and the conversation)

04-19-2009, 11:31 PM	#12 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	well now it dosent bounce any more. its a little high but i can hear my exhaust popping. i only have headers and im not running with a cat. never done that.

04-19-2009, 11:38 PM	#13 (permalink)
PHOENIX Beams Owners Group Join Date: Mar 2005 Location: On Hiatus....... Posts: 7,915 Thanks: 84 Thanked 260 Times in 197 Posts Blog Entries: 1 My Google Map iTrader Rating: (46/100% )	k....just so you know, idle surge (bouncing) is 90% of the time cause by a leak in the intake system. Don't know much about the popping except it could be a fuel/air issue. Usually too much air going into the engine. The pops is excess fuel exploding from poor combustion. Could be you need new spark plugs or you do have a bad air/fuel ratio by excess air. I wouldn't be surprised if you have an intake problem....IE vacuum leak, dirty throttle butterfly, throttle body sensor.

04-19-2009, 11:41 PM	#14 (permalink)
fvillota Cage Fighter Join Date: Feb 2008 Location: MIami Posts: 1,832 Thanks: 65 Thanked 28 Times in 28 Posts iTrader Rating: (6/100% )	i'll check that out. you happen to know where i can get egr block off plates i want to take all the egr crap outta my engine. and yea i might have a leak i guess cause the wire and sparks are new.