lord_tris Posted June 21, 2004 Report Share Posted June 21, 2004 i just got a 91 240sx it has the ka24de and no hicas or lsd, does not smoke and starts fine when it idles how ever i can hear a small poping sound under the hood and the motor moves a little it runs great under about 4000 rpms like when i am in town.. but when i get on the highway its bogs down and does not get up past 3200. what it is doing is back fireing through the engine and sputering on take offs after it reachs running temps. heres my ideas: bad converter,bad exuast,bad injectors,bad throttle body,burnt valve/s any help will be great Quote Link to comment Share on other sites More sharing options...
desperado Posted June 21, 2004 Report Share Posted June 21, 2004 burnt valve, or wiped lob on the cam get a vacuum gauge, and connect it to the mainfold vacuum. the needle should be around 18 to 20 for a stock cam, and not flutter around. If it;s fluttering around, look and cam/burnt valve. If the vacuum is right then goes down slowly with no change in the motor RPM then the cat is plugged. Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 21, 2004 Author Report Share Posted June 21, 2004 thanks for the suggestion Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted June 21, 2004 Report Share Posted June 21, 2004 could be a worn or broken valve spring too. or a bad manifold gasket Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 22, 2004 Author Report Share Posted June 22, 2004 my uncle thinks that it is the exaust cause i do have abad leakand it only happens when i am at operating temps going to buy this http://www.importfan.com/index.asp?PageAction=VIEWPROD&ProdID=5043 this pay day Quote Link to comment Share on other sites More sharing options...
SHIEF Posted June 22, 2004 Report Share Posted June 22, 2004 Clean your maf sensor. Quote Link to comment Share on other sites More sharing options...
Guest wigsite Posted June 22, 2004 Report Share Posted June 22, 2004 Maybe a bad spark plug wire also. Look at the simple things first. Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 22, 2004 Author Report Share Posted June 22, 2004 we have checked the maf and cleaned it,..the wires are new 8.5mm high pro wires with a fireball coil again thanks for the suggestions will double check those though just to make sure there is nothing abnormal going with it Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 23, 2004 Author Report Share Posted June 23, 2004 what do you guys think about a throttle postion senser or the dito being bad Quote Link to comment Share on other sites More sharing options...
BiG BeN Posted June 24, 2004 Report Share Posted June 24, 2004 i would drop the exhaust and drive around the block,see if that helps.also check the cat,see if you can see through it,or just knock it out. also change your fuel filter just for funsies,and if you want to change injectors i have a full set still in the rail i'll let go for like 20$ and a 40oz. Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 24, 2004 Author Report Share Posted June 24, 2004 i might take u up on that offer big ben how many miles where on them when you took them out Quote Link to comment Share on other sites More sharing options...
TurboTank Posted June 24, 2004 Report Share Posted June 24, 2004 i have this same problem, what we need to do is change out the "usdm gasket" and install the "jdm" one. the part number is s13-sr20det. you should be able to pick the up at your local importer..lol Quote Link to comment Share on other sites More sharing options...
BiG BeN Posted June 24, 2004 Report Share Posted June 24, 2004 Originally posted by 240sxdriverone09: i might take u up on that offer big ben how many miles where on them when you took them out 35k they should be good,if not i'll give you back the 20$ but you're screwed on the beer Quote Link to comment Share on other sites More sharing options...
lord_tris Posted June 25, 2004 Author Report Share Posted June 25, 2004 HAAAAAA its fixed it was the coil the whole D@mn time....all well now all i need is the exaust, gotta wait though cause i just got some new toold today yeah. thanks everyone that gave me some info if anyone has a place that they know that sells cheap catback exausts...please let me know i need one that will replace the the whole thing Quote Link to comment Share on other sites More sharing options...
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