TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Tue Oct 24, 2017 3:04 am

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 10 posts ] 
Author Message
 Post subject: Car Backfires...
PostPosted: Fri Jun 20, 2008 9:36 pm 
Offline

Joined: Tue Jan 16, 2007 3:18 pm
Posts: 78
Any suggestions...My engine has been boosted for about 5 mts. (since it's rebuild again) but since then, when I accelerate aggressively I get the engine sounds as if it's backfiring for about 3 secs. then it smoothens out (this happens at about 5000 rpm). When I go over 5500rpm it smoothens out and gives good power. If I retard the timing it gets worst, and if I advance it, the backfiring stops. Is this normally experienced when the timing is backed down too far?. Should I just set the timing at 4BTDC and see the results? I'm running stock ecu, cultus cams n distributor, td04 turbo, a FPR set at about 56psi (on idle), the head was de-shrouded behind the exhaust valves, running about 7.5 psi

Any suggestions will be appreciated

ps. Before doing the rebuild, I had my stock solid cams with vitara pistons and running about 10psi. but never experienced this....

_________________
A wise man nor a fool cannot work without tools.
'93 GTI
'92 Mitsu Lancer
'86 Mazda 323


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Fri Jun 20, 2008 11:21 pm 
Offline
Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
maybe a bad distributor pickup? I had something similar, does your tach ever bounce?

_________________
1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Sat Jun 21, 2008 12:26 am 
Offline
User avatar

Joined: Tue Oct 24, 2006 3:09 pm
Posts: 4998
Location: Palm Springs: Too hot from June to Oct.!
And check your injectors, in case it's a fuel issue.

_________________
DIY Broken Bolt Removal: viewtopic.php?f=22&t=41042
DIY Clutch Adjustment: viewtopic.php?f=9&t=48281
DIY Wheel Bearings: viewtopic.php?f=2&t=29003
DIY Shocks: viewtopic.php?f=10&t=45483
DIY Wheel Align: viewtopic.php?f=2&t=42479
Once you get the cars dialed-in (compression, leaks, bearings, alignment, brakes) swap in new rubber and glass, you've got something which should last for years!


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Sat Jun 21, 2008 6:26 am 
Offline

Joined: Tue Jan 16, 2007 3:18 pm
Posts: 78
The tach doesn't bounce or anything like that, I will have a look at the injectors

_________________
A wise man nor a fool cannot work without tools.
'93 GTI
'92 Mitsu Lancer
'86 Mazda 323


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Sat Jun 21, 2008 12:48 pm 
Offline
Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
for what its worth, removing the injectors takes about 5 minutes, taking them to a diesel shop to get flow tested, cleaned, rebuilt and flow tested again costs 15/injector around here. I gained 12% flow on all 3 of them... just something to keep in mind

_________________
1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Mon Jun 23, 2008 11:30 pm 
Offline

Joined: Fri Jun 03, 2005 4:36 pm
Posts: 493
Location: Roscommon, MI
You can also send them to WitchHunter. Sounds to me like the injectors could be the problem.


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Tue Jun 24, 2008 10:14 am 
Offline
Sad but True...

Joined: Fri Jul 27, 2007 8:20 pm
Posts: 2973
Location: Saskatchewan
why bother boxing them up and sending them away when you can get them done that day?

_________________
1991 Swift GT Build G10 +25 psi + other goodies
1996 Metro Build QR25de swap, still undecided where to take it
the lolcar family


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Wed Jun 25, 2008 8:35 pm 
Offline

Joined: Fri Jun 03, 2005 4:36 pm
Posts: 493
Location: Roscommon, MI
Oh, I must have kind of skipped your original post. Does it misfire at high boost? Check your plug gaps. It sounds like you might be blowing out the spark.

I get that all the time if I don't check that the plugs are gapped tight enough.


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Fri Jun 27, 2008 5:40 am 
Offline

Joined: Tue Jan 16, 2007 3:18 pm
Posts: 78
Rarson....U HIT the nail on the head!!!! It was only when the car got into or above 5psi would I experience the miss. I checked everything else before checking the Plugs, which I thought were good!!!

I pulled out the plugs and checked them...they were gapped at about...TOO WIDE...something like 40 - 50 might be even more. Anyways I replaced them with NGK#7's and gapped those to about 25 - 27. Man the car feels awesome again.

So thank you guys for all the suggestions and assistance...(anyone knows where I can get or recommend a good n fairly cheap piggy back!)

_________________
A wise man nor a fool cannot work without tools.
'93 GTI
'92 Mitsu Lancer
'86 Mazda 323


Top
 Profile  
 
 Post subject: Re: Car Backfires...
PostPosted: Sun Jun 29, 2008 12:33 pm 
Offline

Joined: Tue Jun 06, 2006 4:40 pm
Posts: 41
I currently have a Greddy Emanage blue installed in my car and love that little blue box,it controlls fuel and also ignition.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 10 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group