ka24de rough idle and won't pull

[engineperson]

you guys know that they sell a spray chem. at autozone that cleans the MAFS (its like 4$)> its made for it, i use it all the time. i dont think alcohol would work too well.

[rogoman]

hey man u seem to know your stuff about these cars i would like to talk to you about my car idling at 1800 rpms i cleaned the throttle body with carb and choke cleaner and i disconnected the tps while the car was running and nothing happened so i am not really sure what to do and my car doesn't pull at all under full throttle there are some emissions things disconnected i don't know what to do or if i should even wast my time

If your engine continues to idle real high after it's warmed up, check the air regulator unit. It's located on the passenger side of the engine, below the intake manifold, near the rear. There's a hose connecting to it. Pinch the hose when you are having the high idle condition. If the idle speed drops, there's a problem with the unit.

[MasterOfAngle]

I once had that same problem... I have a 95 240sx with a ka24de. The cause of my problem ended up being a torn hose between the egr valve and transdeucer. I replaced the hose almost 2 years ago and i havent had any problems since.

[nikl240]

I also have been having the power loss problem. I'm pretty sure it's due to slack in the timing chain retarding the cams. It sounds like you guys are having the same problem and it's time for a timing rebuild. Although, power loss can also be caused by fuel delivery, which is a much easier fix. If it's a steady power loss and it seems like the brakes are dragging then it's most likely timing. If it's more like it's actually trying but sputters when you mash it then it's most likely fuel delivery.

If it seems like fuel delivery check your fuel filter by removing it, filling it with carb/brake cleaner on the inlet side (bottom) and shaking. Let it drain into your hand. If it comes out anything other that crystal clear replace it. Before you hook everything back up, check the fuel pump by holding the line in a safe direction and having a friend turn the car over. If you don't get a gasoline shower, replace the fuel pump.

Test drive.

If this didn't fix anything then the next thing to do is rebuild the timing.

Possible write-up when i do mine. Depends on my time availability between class, work, and dealing with my p.o.s.

[leper421]

I once had that same problem... I have a 95 240sx with a ka24de. The cause of my problem ended up being a torn hose between the egr valve and transdeucer. I replaced the hose almost 2 years ago and i havent had any problems since.

I had the same hose blow out, however I never had an idle problem. I'm not denying that this may be the cause of the problem. Any leak in any vacuum line is a problem.

Here are pictures of the hose that connects the EGR to the BPT. These pictures were taken with the engine out of the car. The components in the pictures are positioned next to the firewall.

The following are pictures of the blown hose.http://www.zlimages.com/imageg...9.jpgh ... eg...0.jpg

[leper421]

I also have been having the power loss problem. I'm pretty sure it's due to slack in the timing chain retarding the cams. It sounds like you guys are having the same problem and it's time for a timing rebuild.

The slack in an old timing chain will cause a slight performance hit, but it will not cause a large power loss. The lower chain will start rattling and start eating away at the lower timing cover before it will decrease performance by a significant amount.

If it's a steady power loss and it seems like the brakes are dragging then it's most likely timing.

The brakes have absolutely nothing to do with the engine.

If it seems like fuel delivery check your fuel filter by removing it, filling it with carb/brake cleaner on the inlet side (bottom) and shaking. Let it drain into your hand. If it comes out anything other that crystal clear replace it.

Just replace the fuel filter... there is no need to test it first, just replace it...

[nikl240]

The brakes have absolutely nothing to do with the engine.

Please reread my post and show me where I said the brakes have anything to do with the engine. As far as I know, I stated that it may seem as though the brakes are locked up even though they are not. I was merely trying to provide an accurate representation of what was being experienced. In my case it feels as if there is an actual physical restriction causing the power loss.

As far as the filter, yes it might as well be replaced if your even thinking of dealing with the mess of taking it off. What I stated was just a quick diagnosis method that doesn't require a parts run.

If you really think that it isn't timing then any and all input will be greatly appreciated.

[leper421]

Please reread my post and show me where I said the brakes have anything to do with the engine. As far as I know, I stated that it may seem as though the brakes are locked up even though they are not. I was merely trying to provide an accurate representation of what was being experienced. In my case it feels as if there is an actual physical restriction causing the power loss.

Yes, I miss-read / miss-interpreted your statement.

As far as the filter, yes it might as well be replaced if your even thinking of dealing with the mess of taking it off. What I stated was just a quick diagnosis method that doesn't require a parts run.

The labor involved to test the fuel filter, as you described, is the same labor to replace it (remove and install), including "dealing with the mess of taking it off". Any car parts store will have the filter on hand.

If you really think that it isn't timing then any and all input will be greatly appreciated.

I have previously replaced the timing chain and tensioners on the s13.5 (KA24DE) 240sx. After the install, the engine seemed to run slightly better. I won't deny that slack in the crank timing won't cause a degradation in performance (it definitely will). However, the amount caused by a worn timing chain system will not cause such noticeable problems. That being said, I firmly suggest any 240 owner that has over 100k miles on their engine, or who has a rattling sound coming from the engine, to look into replacing the chain, and more importantly, the tensioners.

Unfortunately, replacing the chain and tensioners is a large job. The entire front of the engine needs to be stripped down, and the oil pan needs to be removed in order to remove the lower front timing cover. It took me over six days to do it the first time, although I could do it now in two to three full days. Shops will charge over $1000, because it is a time intensive task.