Hondaswap.com | Honda Technical & JDM styling Forums

mustang67n · 08-16-2006, 02:04 AM

ok.. i was driving my honda (89 dx w/e SOHC ZC) and i heard it backfire from the IM. i know it kinda boggs a bit from 1/2 to full throttle, but this time it backfired!
im running a PM6 ECU.. idk whats wrong..

im going to check my timing tomorrow.. all my fuel system is stock..

AHH! help!

formby · 08-16-2006, 11:21 AM

how do you know it was from the IM

jlicrx · 08-16-2006, 12:41 PM

backfiring thru intake manifold usually caused by ignition timing too far advanced, camshaft timing not right or intake valve not seating properly (could be bent) - could also be spark plug wires not in correct order

mustang67n · 08-16-2006, 03:48 PM

the only way im assuming it was from the IM is because the sound came from the front of the car. it was a distinct backfire sound (the 'pop' sound)

i'm going to try to check my timing ASAP, thanks jlicrx

Andrew · 08-16-2006, 04:38 PM

Loud "POP" then white smoke from plug??? Urgent!

mustang67n · 08-16-2006, 08:03 PM

did that end up fixing it for you? the firing order?

i'm going to pull the honda into the garage when i get a chance and check all that.
but im almost positive my firing order is correct 1342 i believe is how its plugged

K2e2vin · 08-16-2006, 08:12 PM

make sure its going the right way. I did 1342, but did it the wrong way(ended up being 1243), and had that exact intake poping noise. I know for sure it was intake too, because the intake pipe was pointed right towards me.

mustang67n · 08-16-2006, 08:16 PM

right on guys.. im going to check that for sure ASAP.
and if thats all good. im going to take a timing light to her (if i can get my hands on a buddys because im currently broke) lol

mustang67n · 08-16-2006, 09:43 PM

problem fixed..
see
http://hondaswap.com/hybrid-ed-ef-da/no-change-throttle-power-72174/#post689085

Andrew · 08-17-2006, 04:13 PM

glad to hear it's fixed.

btw, all i needed as to connect one vacuum line(from that plug pictured to the Emissions purge thingy on the Firewall...)

intheearlyhours · 06-16-2009, 02:51 PM

Ok i got a 91 civic dohc ZC and im having the same problem. I checked timing and the firing order didnt change for no reason. If you could give me some more options of things to check that would be great.

intheearlyhours · 06-22-2009, 07:53 PM

ok i advanced my dizzy all the way and my backfiring so far has gone away weird cuz i just did the timing.

08-16-2006, 02:04 AM	#1
mustang67n Senior Member Join Date: Jun 2006 Age: 20 Posts: 149 iTrader: 0 / 0% Rep Power: 8	backfire through IM!? ok.. i was driving my honda (89 dx w/e SOHC ZC) and i heard it backfire from the IM. i know it kinda boggs a bit from 1/2 to full throttle, but this time it backfired! im running a PM6 ECU.. idk whats wrong.. im going to check my timing tomorrow.. all my fuel system is stock.. AHH! help!

08-16-2006, 11:21 AM	#2
formby learning in progress Join Date: Feb 2003 Age: 27 Posts: 5,742 iTrader: 4 / 100% Ride: 00' Montero sport, 99' lsv civic Rep Power: 93	how do you know it was from the IM __________________ SOMETIMES IN LIFE WE ALL NEED CHANGE! http://pandora.com/

08-16-2006, 12:41 PM	#3
jlicrx Senior Member Join Date: Jun 2003 Location: Colorado Springs Posts: 1,570 iTrader: 0 / 0% Rep Power: 64	backfiring thru intake manifold usually caused by ignition timing too far advanced, camshaft timing not right or intake valve not seating properly (could be bent) - could also be spark plug wires not in correct order __________________ ZCspeed Racing

08-16-2006, 04:38 PM	#5
Andrew Senior Member Join Date: Mar 2006 Location: Tallahassee, FL Posts: 2,589 iTrader: 1 / 100% Ride: 1991 CRX Si Rep Power: 47	Loud "POP" then white smoke from plug??? Urgent! __________________ 1991 CRX Si 2007 Civic Si Sedan My Engine Swap Write-ups: HG FPR Wheel Smiley Cluster. Adapters.

08-16-2006, 08:12 PM	#7
K2e2vin Senior Member Join Date: Jan 2003 Location: Raleigh, NC Age: 22 Posts: 6,358 iTrader: 2 / 100% Ride: 88 Honda Civic HB Rep Power: 150	make sure its going the right way. I did 1342, but did it the wrong way(ended up being 1243), and had that exact intake poping noise. I know for sure it was intake too, because the intake pipe was pointed right towards me. __________________ 1988 Honda Civic Standard-more mods than I want to list 1992 Honda Accord LX 1996 Toyota Avalon-Spun bearing, for sale. Terrorists have successfully attacked our imagination. RIP Jon Eban Nie, August 31, 1991 - May 7, 2006 Y-Daniel Siu Eban, September 7, 1986 - May 7, 2006


Welcome, Guest! Please Register or Login: User Name Password Members have access to more features, better search, and see fewer ads! It's free, what are you waiting for?

08-16-2006, 03:48 PM	#4
mustang67n Senior Member Join Date: Jun 2006 Age: 20 Posts: 149 iTrader: 0 / 0% Rep Power: 8	the only way im assuming it was from the IM is because the sound came from the front of the car. it was a distinct backfire sound (the 'pop' sound) i'm going to try to check my timing ASAP, thanks jlicrx

08-16-2006, 08:03 PM	#6
mustang67n Senior Member Join Date: Jun 2006 Age: 20 Posts: 149 iTrader: 0 / 0% Rep Power: 8	did that end up fixing it for you? the firing order? i'm going to pull the honda into the garage when i get a chance and check all that. but im almost positive my firing order is correct 1342 i believe is how its plugged

08-16-2006, 08:16 PM	#8
mustang67n Senior Member Join Date: Jun 2006 Age: 20 Posts: 149 iTrader: 0 / 0% Rep Power: 8	right on guys.. im going to check that for sure ASAP. and if thats all good. im going to take a timing light to her (if i can get my hands on a buddys because im currently broke) lol

08-16-2006, 09:43 PM	#9
mustang67n Senior Member Join Date: Jun 2006 Age: 20 Posts: 149 iTrader: 0 / 0% Rep Power: 8	problem fixed.. see http://hondaswap.com/hybrid-ed-ef-da/no-change-throttle-power-72174/#post689085

08-17-2006, 04:13 PM	#10
Andrew Senior Member Join Date: Mar 2006 Location: Tallahassee, FL Posts: 2,589 iTrader: 1 / 100% Ride: 1991 CRX Si Rep Power: 47	glad to hear it's fixed. btw, all i needed as to connect one vacuum line(from that plug pictured to the Emissions purge thingy on the Firewall...) __________________ 1991 CRX Si 2007 Civic Si Sedan My Engine Swap Write-ups: HG FPR Wheel Smiley Cluster. Adapters.

06-16-2009, 02:51 PM	#11
intheearlyhours Member Join Date: Jun 2009 Age: 22 Posts: 59 iTrader: 0 / 0% Rep Power: 1	My civic Ok i got a 91 civic dohc ZC and im having the same problem. I checked timing and the firing order didnt change for no reason. If you could give me some more options of things to check that would be great.

06-22-2009, 07:53 PM	#12
intheearlyhours Member Join Date: Jun 2009 Age: 22 Posts: 59 iTrader: 0 / 0% Rep Power: 1	ok i advanced my dizzy all the way and my backfiring so far has gone away weird cuz i just did the timing.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bad stutter and backfire	silva95teg	HYBRID -> EG-EK / DC	15	06-19-2006 08:06 PM
HUGE backfire while car not on	formby	General Tech and Maintenance	7	03-31-2006 11:46 PM
Pontiac Backfire... er Sunfire for sale	5speed4life	Vehicles: For Sale/Trade/Wanted	3	06-12-2005 11:14 PM
Intake Backfire please HELP!	takinbackchristo	General Tech and Maintenance	0	09-19-2003 04:10 PM

Hondaswap.com | Honda Technical & JDM styling Forums

backfire through IM!?