1995 240sx Running Rough

[jessead82]

Hello everyone. I have finally gotten the car up and running. I got the timing set right (I think), but when the car is at idle it runs rough. When I pull the number 4 wire to the plug nothing happens. No bog down or stall. The same thing also on plug number 3. Now when I pull plug number one or two the engine stall immediately. I have installed a new distributor so I don't think that could be the problem. I have also put in new plugs and wires. I have have tried swapping the wires and plugs around to see if I get different results, but nothing changes. Just for clarity though firing order is dist. 1234 and the plugs are 1234 from front to back right? Thanks

[rickgerhardt]

Theres your prob. Firing order on distributor is not 1234 its 1342. And on the block it runs front to back 1234.

[rickgerhardt]

If you have that right then make sure your getting fuel. If your getting fuel then its a valvetrain problem. Just went through the same stuff with mine. Turned out I had two bent valves when they shipped the head to me but was not visible to the eye. Do a compression check if it comes down to that. You can rent them at Autozone for $35

[jessead82]

I checked the firing order and it is correct. Do you think that I may have fouled out the plugs. I did flood the engine a couple of times while trying to get the timing set. Also I didn't pull the TPS plug when I set timing. Could any of those be an issue?

[jessead82]

Can any help me with this. I would love to get my car back up and going. Its been down for over a month now. Thanks everyone.

[Klits562]

i did the same thing you did with the firing order in 1234make sure its running counter clock wise in 1342if ur 100% is correct then i dont think your plugs will be fouled cause i did this for a while and my plugs were fine.you can check them see if they are burnt and check the cylinder for fuel. If thats all fine then check your injectors or spark plug wires.

[jessead82]

Ok I have checked the plugs, wires, and injectors. As far as I can tell they are all in good working order. I was talking to someone today at work about it and they said something about the distributor could be put in at 180* out. What does that mean and how do you fix it. I used a timing light and checked the marks and they are set right at 20* btdc. So could the distributor still be 180* out if the timing is right? Thanks

[jessead82]

Ok went today and got new plugs and wires. That still didn't fix the problem. Any other ideas they may help?

[Klits562]

Ok I have checked the plugs, wires, and injectors. As far as I can tell they are all in good working order. I was talking to someone today at work about it and they said something about the distributor could be put in at 180* out. What does that mean and how do you fix it. I used a timing light and checked the marks and they are set right at 20* btdc. So could the distributor still be 180* out if the timing is right? Thanks

do you know were the number one firing order is on your engine? Idk if the dohc and sohc have the same position on the dizzy i know the sohc is on the bottom right corner, so when the timing is right remove the cap on the dizzy and look at were the spinny thing is if its on the one spot then your timing should be right, if its not in that spot then you are in fact 180* out this happened to me i had it at TDC and i was 180* off

If you are 180* out what you need to do is grab a friend jack up your car and and remove your oil pump and the dizzy crank thing should come with it now you need a friend to hold the dizzy in the first position and you have to line the crank up with the dizzy and get the tooth on perfect once thats done put everything back together and you should be on the right firing order

[jessead82]

Ya i checked the timing on the dist. at tdc and it is lined up perfectly. Also I got the firing order like this PLUGS 1-2-3-4 (front - back) and 1 2 3 4.

[rickgerhardt]

If the distributor was 180* out then it wouldnt even start. So thats automatically thrown out. Did you do a compression check? If your injectors are workin fine then it sounds like a bent valve. Happend to me

[jessead82]

I have been researching and also found something about injectors beening stuck open. Would valves be bent on both 3 and 4 cylinders or would the injectors be stuck open on both also?

[rickgerhardt]

Its possible their both bent. Easiest way to find out is to run a compression check on it. Autozones got em for $30 then you get it back when you return it. Are you reusing your injectors from your old engine? If so I doubt their stuck open, if they are you will see a huge puddle of fuel on top of the piston if you pull out the spark plugs and look in there with a flashlight.

[jessead82]

Nah this isn't a new engine. Its the same 190k miles motor lol. If I get the compression checker and everything is ok then what would my next step be? Thanks

[rickgerhardt]

Well if you have compression then the only other two things it can be is spark or fuel. If your timing is correct and you have spark then it narrows it back down to fuel.

[jessead82]

Well I got 2 new injectors today and put them in and nothing so I went back and picked up a compression tester and going to try it tomorrow. I hope it turns out good.

[rioredstang]

Check compression on that cylinder. if low then probly valve problem. You must unplug TPS to put computer in base timing mode to set timing. also could be a head gasket strarting to fail.

[madrift]

dont kno the background of the car but if the two that are missing are next to eachother could be a blown head gasket...but yep a compression test would be neccesary. just sayin, hopefully nothing that bad tho.