90 300zx n/a very rough idol.

[kool-aid54]

car idles like its carburated and if I feather the gas it reacts slow. I also accidently pushed on the, I think its the throttle position sensor and the fuel pressure jumped. The car was off with the key in the "on" position. Sometimes it will idle like crap at about 500rpms and then I'll feather the gas and it will jump up to 3000 or 4000 rpms and die. Now, there is about NO exhaust on this car. Previous owner cut it off just before the cat's. Also how many injectors should have o-rings. When I pulled the rail to clean it and the injectors I think only one fell off. I has the seals that seal them to the upper intake manifold, the ones that go on the ourside of the injector. But, I think there are suppose to be littler ones that go on the shaft around the part that the fuel comes out. Now I put in new plugs. I t running like crap because there is no exhaust? By the way, when the car did idle for a few minutes, the check engine light did not come up.

Please help!!!!!!

[nsrZ32]

could be bad sensors or dirty connections. could be bad injectors (not an uncommon problem on Z32's)...and there should be an o-ring on each of them.

[freakonaleash1187]

there should be two o-rings on each injector, one small one close to the bottom and one big one close to the top. a rough idle could be due to tons of things, bad TPS, dirty throttle bodies, bad spark plugs, bad fuel injectors, ect.

[nsrZ32]

there should be two o-rings on each injector, one small one close to the bottom and one big one close to the top. a rough idle could be due to tons of things, bad TPS, dirty throttle bodies, bad spark plugs, bad fuel injectors, ect.

lol ok so I feel like a moron for assuming he knew there'd be one in each place. figured that would kinda be a given though

But definately agree...rough idle could be any of a million things, especially if the car was mistreated/neglected at some point.

[kool-aid54]

thank you guys, as far as o-rings I had the fuel rail out and I couldn't get the injectors out of the fuel rail. So, I sprayed carb cleaner down in the tube till it was full and let it set for a day and repeated. The only o-rings I say were the big ones that the actual injector sat in. It goes between the injector and the lower intake manifold. Also the guy I bought it from said the he thought the egr control valve was going bad before he wrecked it. I've brought the car from starting and stalling to barely running so I'm slowly getting there. What about what I said about the exhaust?

[freakonaleash1187]

it shouldn't run bad because of a more open exhaust, the only thing in exhaust that could make it run bad is a clog. unless you don't have enough back pressure, n/a's need some back pressure. but still, i don't think it would be enough to make your car run real crappy.

[kool-aid54]

I'll see if I can test the egr and I don't know if I want to tear that upper intake manifold off again. I plan on just selling the car to start my business.

[eric230]

check you intake maybe your bypass valves aren't on all the ways but just check your intake for any leaks after the mass air sensor. then check your harness mine had a bunch of corrosion in it and cleaned it and it doesn't kill anymore.

[kool-aid54]

i think it might be my thrittle position sensor?

[kool-aid54]

replaced the TPS. It idles fine. Now my problem is that the car won't run with the MAF hooked up. I tried two different MAF's. Unless both are bad I don't know what to do. I try to start the car with the maf and it won't start. I unplug the maf and it runs, then when I rev it, it'll rev alright and then shoot up in rpm's and almost shut off all by itself.

[ama230]

check your harness for oxidation... try wiggling to see if it makes a difference clean it out b/c mine needed it 300zx n/a 92. Then try the fuel pump and even simple connections then check the connector plugs for the spark plugs the connectors are notorious for going out the car idles harsh eh... i think the connector maybe loose if not tell me what changes

[kool-aid54]

well after hooking up all of the vacuum lines and intake tubes it runs and idles fine. NOW, my problem is it will start and run in limp mode(without the MAF plugged in), but when I plug in the MAF the car shuts off. I try to start it and it starts for a second and immediately shuts off. I installed a new MAF and it did the same thing. I can drive the car in limp mode but it won't go above 2400 rpms. PLEASE Help I'm so close to finishing this beast.