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19-03-2014, 12:51 AM | #1 |
Senior Member
Join Date: Jun 2011
Location: Brisbane, QLD
Car: 2003 BJ-II 323 Astina Hatch
Posts: 588
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Car feels like it has lost power
I feel like my car has lost a bit of oomph lately, and I dont know what to put it down to. My first thought is the exhaust. It was previously fitted to a 2.0L that SwiftJimmy had (i think it was an FSZE). is it possible that the diameter is too large and thus reduced back pressure? Could that also be the reason behind the fartiness and raspyness of the exhaust?
I've checked the spark plugs and they're a ok... Coil packs/ignition leads is another thing that COULD be worth mentioning (I'm still a car noob), but apart from that, i have no bloody idea. If you guys have thoughts on the matter, or think im crazy, i'd love to hear it. |
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19-03-2014, 05:48 AM | #2 |
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fuel filter (in tank), not sure on what diameter exhaust you have, and yes it was on a fs-ze, was the cat changed with the exhaust?
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19-03-2014, 08:54 AM | #3 |
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Join Date: Sep 2004
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check condition of air filter.
just cleaned mine yesterday. covered in black oil, leaves and bugs. also noticed loss of power and 10% increase in fuel usage recently. feel better on throttle now. also exhaust if too big could be causing issues under 3000rpm. but above that shouldn't be an issue. |
19-03-2014, 10:15 AM | #4 | |
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Join Date: Jun 2008
Location: Auchenflower, Brisbane
Car: Blue SP20
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Quote:
Given the exhaust is of the same design (in terms of bends etc) backpressure will be relatively the same. What you've done is increased the diamater of the pipe and thus decreased velocity at low rpm which will result in a drop in low end performance. The trade off is that at higher rpm you can flow more volume at a lower velocity thus improving high rpm. Low velocities is what causes raspiness generally. When does the auto shift? Could be multiple of things, you've gotten used to it. My car no longer feels fast for example. Otherwise Fuel, Cat, Fuel Filters, Air Filter might need replacing or cleaning etc. It takes about a tank for the stock ecu to adjust its maps for the increased octane.
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19-03-2014, 02:13 PM | #5 | ||||
Senior Member
Join Date: Jun 2011
Location: Brisbane, QLD
Car: 2003 BJ-II 323 Astina Hatch
Posts: 588
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Thanks guys, I'll check the fuel filter as well |
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19-03-2014, 04:09 PM | #6 |
Senior Member
Join Date: Jun 2008
Location: Auchenflower, Brisbane
Car: Blue SP20
Posts: 2,782
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Yeah my car rasps around that territory too IIRC. (Kinda hard to tell with no gauge displaying revs to tell specifically)
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20-03-2014, 11:35 AM | #8 |
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Join Date: Aug 2005
Location: Salisbury - Inner City
Car: 1997 BA Hardtop - Had a 2003 BJii J48 Sport20, and 2x bg SOHC astina hatches
Posts: 5,011
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is this happened after we put the coilovers in??? might be the toe causing more drag on the car... or the cat in the muffler getting poo. or the air filter (pod filter) getting blocked.. id do a full service (oil, air filter, fuel filter) can do it at my house one arvo if u like
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20-03-2014, 12:04 PM | #9 | |
Senior Member
Join Date: Jun 2011
Location: Brisbane, QLD
Car: 2003 BJ-II 323 Astina Hatch
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Mat keeps suggesting this, but ive had a look under the car all away along the exhaust system and cant see any black residue. The only other option is that theres a crack underneath the exhaust manifold
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20-03-2014, 12:18 PM | #10 |
Moderator
Join Date: Oct 2005
Location: Ipswich, Queensland
Car: 2002 Mazda Astina SP20 2006 Mazda 6 GY Wagon
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Clean the pod man, it'll make the world of difference!
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20-03-2014, 02:33 PM | #11 |
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Join Date: Dec 2002
Location: Location: Vic
Car: Mazda '95 Astina I4, '86 B2K and '10 3 MZR-CD
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How long since the car has been serviced.
Cover off the normal wear and tear items first. Reminds me of... http://www.youtube.com/watch?v=qa77k25g6wQ
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20-03-2014, 04:05 PM | #12 |
AstinaGT Regular
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even though plugs look ok they may still be stuffed so don't turn a blind eye to that
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2002 Mazda Astina 323 SP20 |
20-03-2014, 10:32 PM | #13 |
Junior Member
Join Date: Aug 2010
Location: Nowra
Car: SP20 2002
Posts: 207
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Its more likely air restriction then anything else (if the cars runs okay but has just lost power), get a new air filter or clean the one you have, also if its been a while change the plugs, (only cost you $20 for a new set), I doubt its the coil pack (think you would notice other things besides the power loss), I just did the plugs, new pod, engine oil and filter and it cost me about $130 that's nothing for piece of mind.
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20-03-2014, 11:26 PM | #14 |
AstinaGT Regular
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also clean your afm sensor
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2002 Mazda Astina 323 SP20 |
21-03-2014, 09:21 PM | #15 |
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Join Date: Mar 2013
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Nothing intersting happens until you hit 4k rpm :P
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23-03-2014, 01:51 AM | #16 | ||
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Join Date: Jun 2011
Location: Brisbane, QLD
Car: 2003 BJ-II 323 Astina Hatch
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You mean maf? I give that a clean with a bit of water on a rag lol. |
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24-03-2014, 12:51 PM | #17 | |
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Join Date: Jun 2008
Location: Auchenflower, Brisbane
Car: Blue SP20
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In the absense of a like button. *Like*
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Id use degreaser or contact cleaner on the wire as the main culprit is oil from the filter causes **** to stick to the element.
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14-04-2014, 08:52 PM | #18 |
Junior Member
Join Date: Apr 2009
Location: Sydney
Car: Astina BG 1991 - Rx7 S4
Posts: 105
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It could be anything, but more info would help.
Did it happen right after you changed the exh, or did it happen one day out of the blue without touching anything. PS That Ice88 has his sh!t together, he knows how exh works. Last edited by Old Grey; 15-04-2014 at 06:11 AM. |
14-04-2014, 10:19 PM | #19 |
Senior Member
Join Date: Jun 2010
Location: wollongong
Car: 99, BJ 323 astina hatch
Posts: 1,506
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Sam if you go to super cheap or repco either one and get a can on AFM or MAF there the same thing. But the MAF sensor cleaner by CRC. And the pull the MAF off and give it a really good spray with that ****.
Also get some throttle body cleaner and give the throttle body a clean. And while your at it also get a can of the nulon upper engine cleaner and give it a hit with that. But defiantly change you fuel filter if you haven't done so yet.
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