Homer Posted October 5, 2010 Share Posted October 5, 2010 No jokes please My NA seems to be lacking power, just had a fellow NA owner take it out who confirmed.. There's no misfire noticable and everything seems to be working, is there anything obvious to check considering there doesn't seem to be an ignition issue? Quote Link to comment Share on other sites More sharing options...
kill1308 Posted October 5, 2010 Share Posted October 5, 2010 (edited) Check to see if the Turbo's are missing.... If they are, it's an NA and perfectly normal On a serious note I guess things to check could be, Fuel Filter, FPR, spark plug gap...? Not too up on the NA but those are the things I would look at on any other engine so I guess it would apply. The NA has a distributor based ignition doesn't it? Have you checked dizzy cap, rotor arm etc, I know you said there were no misfires and the ignition was fine, but worth checking if you haven't already? Is it decatted? Once you've checked the obvious, maybe a compression test is in order? I'm no mechanic though, so my opinion might not be worth much Hope you get it sorted Edited October 5, 2010 by kill1308 (see edit history) Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted October 5, 2010 Share Posted October 5, 2010 shyt petrol darryl? were did you fill up last and how long has the car been standing? Quote Link to comment Share on other sites More sharing options...
johnny g Posted October 5, 2010 Share Posted October 5, 2010 A quick run on a RR to take AFR is ok? Full service, new fuel filter, air filter, plugs, etc.. Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted October 5, 2010 Share Posted October 5, 2010 put a sock over the air filter and rev the nuts off of it while spraying some of that cleaner fluid stuff in. will smoke round the back but will clean it up a lil. also you guys may laugh but a mates car was running lumpy and turned out there was a dead squirrel in the exhaust but this was pretty noticeable because the car just went so quiet! Quote Link to comment Share on other sites More sharing options...
Nic Posted October 5, 2010 Share Posted October 5, 2010 Variable intake butterfly not opening? Quote Link to comment Share on other sites More sharing options...
kill1308 Posted October 5, 2010 Share Posted October 5, 2010 turned out there was a dead squirrel in the exhaust but this was pretty noticeable because the car just went so quiet! Haha, that's hilarious ! Not for the squirrel obviously, but that's quite random! Quote Link to comment Share on other sites More sharing options...
adnanshah247 Posted October 5, 2010 Share Posted October 5, 2010 Haha, that's hilarious ! Not for the squirrel obviously, but that's quite random! he was on holiday for 4 weeks and his car did have a rather mahoosive exhaust! Quote Link to comment Share on other sites More sharing options...
AndrewOW Posted October 5, 2010 Share Posted October 5, 2010 he was on holiday for 4 weeks and his car did have a rather mahoosive exhaust! An exhaust is a bit of a funny place to go on holiday! Quote Link to comment Share on other sites More sharing options...
jazz1 Posted October 5, 2010 Share Posted October 5, 2010 Your having the same symptoms I had with my supra being parked for so long, and I also did with my clutch. Iv been using the lique moly stuff and driving it more. The cars started to pick up more power, i reckon being parked for 7 years my valves were sticking etc as I did have low compression Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted October 5, 2010 Share Posted October 5, 2010 Unless there has been a sudden rise in Squirrel suicide's, i doubt its the exhaust;) Have you been driving a TT/single just lately Darryl? that would be my bet:innocent: Quote Link to comment Share on other sites More sharing options...
Scott Posted October 5, 2010 Share Posted October 5, 2010 Does the person who drove it have a big loud exhaust? Perception of speed can sometimes throw you way off. New rotor and dizzy in place? Timing? Quote Link to comment Share on other sites More sharing options...
w41k3r Posted October 5, 2010 Share Posted October 5, 2010 mines like this at the moment ive done spark plugs oil filter and oil o2 sensors took intake manifold of cleaned inside cleaned apexi air filter checked exhaust manifold gaskets ect and for damage reset ecu still on v power checked tyre pressures as rears were a little down change vac pipes last time my car felt sluggish it was a caliper sticking this time its not lol so im trying to locate the source...... fuel filters next to be changed also as a comparison my bros 1.6 vtec civic can keep up till 3rd gear which is stupid as before it would be behind by half of first gear he finds it funny though im due at the garage to have compression ect checked just incase as at the mo it just has no go I will be checking timing as scott says as on my bros civic it managed to jump and mess the timing up and his car was similar on a private road of course it managed 6200rpm in 5th gear quite easily so not quite sure whats going on Quote Link to comment Share on other sites More sharing options...
barneybrendan Posted October 5, 2010 Share Posted October 5, 2010 going on what nic said,when i removed the butterfly from my plenum it was pretty scabby on the ends of the pivot.I would imagine an air leak on one of the small pipes would also effect that butterfly opening correctly. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted October 5, 2010 Share Posted October 5, 2010 The sound deadening in my SZ-R's back box got loose and restricted the exhaust gases to such an extent that the car wouldn't pick-up. http://www.mkivsupra.net/vbb/showpost.php?p=2762344&postcount=11 Quote Link to comment Share on other sites More sharing options...
Neil-NA Posted October 5, 2010 Share Posted October 5, 2010 also as a comparison my bros 1.6 vtec civic can keep up till 3rd gear which is stupid as before it would be behind by half of first gear So you fancy that race now When i first picked up my car it had been stood for quite a while and felt very 'restricted' even after a service it didnt feel much better. i Had a good few days of giving it hell through the gears and it seems to have cleared it up. Anytime it feels like its driving poo i give it a clear out blast and it seems to work, looks like a few others get similar problems to me. Checked all earthing points? Quote Link to comment Share on other sites More sharing options...
w41k3r Posted October 5, 2010 Share Posted October 5, 2010 actually a little side by side action might be a good idea let me know how much the car is actually down by also had a play with the 2nd butterfly in the manifold cable tied it in open position then in closed position in closed mode when it gets to its usual switching time boy is it slow like it just gives up also it seems to me that either way changes the exhaust note which seemed cool ha Quote Link to comment Share on other sites More sharing options...
Homer Posted October 5, 2010 Author Share Posted October 5, 2010 Thanks for all the feedback guys, some good pointers there and gives me some ideas to work on Just to try and rule out a few: - Rob drove my car immediately after driving his own one (and I've also driven his NA quite a few times). There is a very noticable difference between the two and you'll just have to trust me that it's not exhaust noise making the difference. It feels like it's got 60-70% of the power of his one - Power is down equally across the rpm range. - The 2nd butterfly in the intake appears to be working as there is the normal noticable pickup in power around 4.5k RPM - Car has not been serviced recently however the fuel filter and air filter are new - Petrol is fresh, it was empty initially and has had two complete fill ups since the MOT last month - Rotor and dizzy are like new, along with the leads. There's no sign of misfire, so could it really be a weak spark? Question on the buttery valve - are there one or two of them in the intake? Suspect items from what you've mentioned: - blocked exhaust? The 1st cat has not been off and had a hard knock when we removed the engine a couple of years ago - maybe one cat is blocked/damaged? There is a small leak on one of the joins so may be highlighting a problem with back pressure on the 1st branch... - Fuel pump? Pulled from a box in Jez's yard so maybe on it's way out or just past it's useful life - Spark plugs - looked new but have not replaced. They are probably 3 years old, but have liekly done less than 1k miles Quote Link to comment Share on other sites More sharing options...
Andy Blyth Posted October 5, 2010 Share Posted October 5, 2010 I would consider looking at cam timing and spark timing. Make sure the marks on the cam and crank pulleys line up and also get a timing light to check the ignition advance at idle. Quote Link to comment Share on other sites More sharing options...
kill1308 Posted October 5, 2010 Share Posted October 5, 2010 A blockage in the cat could cause a loss in power due to a buildup of backpressure I'd have thought.... another thing worth investigating I'd say if you've explored most of the other options now. If you're mates got an NA you could always try his exhaust Are you definitely sure it's not ignition related? Hopefully someone who knows what they are talking about will be along shortly though Quote Link to comment Share on other sites More sharing options...
TRD-Rob Posted October 5, 2010 Share Posted October 5, 2010 if i say lose a bit more wight will i get banned ? Quote Link to comment Share on other sites More sharing options...
Homer Posted October 5, 2010 Author Share Posted October 5, 2010 if i say lose a bit more wight will i get banned ? Thanks for the useful input mate It was definetely down on power though through the entire rev range wasn't it? Quote Link to comment Share on other sites More sharing options...
dude Posted October 5, 2010 Share Posted October 5, 2010 YOU think it feels slow!!!!!!!! Imagine how the poor car feels!!!! Quote Link to comment Share on other sites More sharing options...
dwayne Posted October 5, 2010 Share Posted October 5, 2010 i'm going for the cat. my cousin had a cat go on his mr2 and it sounds like what you describe. it was in bad shape and got clogged up more and more over time. it might be worth borrowing one or a decat pipe to rule it out Quote Link to comment Share on other sites More sharing options...
TRD-Rob Posted October 5, 2010 Share Posted October 5, 2010 Thanks for the useful input mate It was definetely down on power though through the entire rev range wasn't it? yeah just seemed like it was holding back,not a lot tho as it is a na Quote Link to comment Share on other sites More sharing options...
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