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Post by wesida on Aug 27, 2005 15:00:31 GMT -5
Hello everyone. I have a nissan 240sx 1991 DOHC. it was working fine untill something happend and it went very bad, lost lots of power. so i took it to a pro shop they said i need a new cylinder head (apparentley there was a crack and one of the valves were leaking) and it will be expensive to put it. so i just bought a rebuilt head myself and gave it to one of the independentt mechanics to put it on for a cheaper price. so ok he puts it on and from there new problems start:
after the head, needed new fuel injectors, new timing kit(everything), replace MAFS, replace some belts, replaced fuel regulator. now after all of this plus labor = $1400
after all of this the car doesnt' not want to work right, its sputters very bad when accelerating and there is not power at all(it's worse then ever) and alot of times it dies when it's ideling, its like when one of thethe spark plug wires is unplugged symptom. we checked the timing and it was fine. i dont know what else to do i spent so much money on this. new engine swap? or should i keep trying to fix it??
appreciate anyone's help
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Post by Venturi on Aug 29, 2005 10:53:38 GMT -5
Hi wesida, welcome to the site.
As you said it seems things have gone from bad to worse. I really don’t understand why all of those items were replaced except the timing kit if you just had a bad cylinder head.
If the engine has a constant misfire the first step would be to determine which cylinder(s) is misfiring and then find the cause. A cylinder needs compression, an air/fuel mixture and spark all arriving at the appropriate times in order to produce power. Determination of the cause of a misfire is usually a fairly straightforward process of elimination that does not involve multiple part replacement.
It sounds like your mechanic needs to back up and go over the basics rather than replacing parts in the hope that the problem gets mysteriously solved. It might be a good idea to get a second opinion before you sink any more money into this thing on unneeded repairs.
Good luck, keep us posted.
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Post by wesida on Sept 2, 2005 22:28:47 GMT -5
Hello Venturi, how are you doing. thanks for replying.well the problem is the cylinders all have good compressions.the parts were replaced because they were all bad. now it seems like the engine is getting too much fuel for some reason. when we pinch the fuel line the car will run smooth. and not shake or stall when ideling. it seems maybe as if the mechanic missed up on the timing and maybe the cams are off, but he said he checked the timing and it was good. iam still thinking the cams are off,and the exahust and intake valve are not opening and closing on the right time. i printed out some papers for him from the net and he said he will look at it. don't get me wrong, this guy is pretty good actually. i wish i had the right tools to work on my own engnie. iam not a pro or anything but i like to experience and learn
if nothing comes out good then iam gonna have to order a rebuilt engine (ka24de)
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Post by Venturi on Sept 3, 2005 8:45:45 GMT -5
wesida, do you know if the fuel pressure has been checked? Are the plugs fuel fouling?
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Post by wesidaguest on Sept 3, 2005 22:08:00 GMT -5
humm i'll have to ask the mechanic about that. iam thinking about just taking the thing to Nissan but they're gonan charge me like no other ;D. but i'll ask the guy first. i can't contact him untill tuesday
thanks alot venturi for the support. i'll let you know what happens
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stan
New Member
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Post by stan on Sept 5, 2005 17:13:23 GMT -5
 I'm new here but I'll chime in. When he is checking the fuel pressure, have him check the pressure regulator also. Sounds like a case of diagnosis by parts replacement to me. I too recommend another opinion.
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Post by wesidaguest on Sept 6, 2005 18:31:51 GMT -5
we'll been trying to get hold of the guy. just found out his out of town till next week.. bad luck huh. i really dont know. iam thinking about just putting awhole other engine in there. change themotor what you guys think?
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Post by Venturi on Sept 7, 2005 11:16:44 GMT -5
Well that choice is ultimately up to you but if the engine is in good mechanical shape it would seem to be a needless expense to me. And since at that this point you don’t know what the current problem is, who’s to say that the problem won’t get transferred to the new engine?
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Post by wesidaguest on Sept 7, 2005 18:38:04 GMT -5
yeah it does seem like it but i just spent way too much money on that motor. even the mechanic says he doesnt' know whats goin on  . and this dude is pretty good. i mean i could take it to Nissan (which is impossible now on the way its running) or keep buying parts and spend more money. i agree and thought about it for nights on that the problem could be little but who knows for now. i was thinking of getting awhole new frontclip motor (SR20DET) redtop, the one i have now is a stock 240sx engine KA24DE. the frontclip comes with everything so i don't think it will cost alot of problems providing that the parts work good. thanks alot man for the help i really appreciate it. i will let you know what happens next!  |
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Post by Venturi on Sept 10, 2005 7:34:57 GMT -5
Good luck, keep us posted.
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Post by wesidaguest on Sept 22, 2005 3:28:11 GMT -5
well it came out to be the guy who did my timing kit missed up on the timing chain by anotch or two, iam on the process on fixing it. THANKS ALOT everyone
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Post by Venturi on Sept 23, 2005 8:24:34 GMT -5
Glad to hear you found the problem. Good luck |
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I'm new here but I'll chime in. When he is checking the fuel pressure, have him check the pressure regulator also. Sounds like a case of diagnosis by parts replacement to me. I too recommend another opinion. 