Nissan Question

[alyssasdaddy]

I know Nissan on a ford specific forum but i am a member and owner of a ranger and an explorer and nothing else.

I am working on this Nissan that needed a knock sensor and an O2 Sensor replaced both (Knock required the removal of the whole intake man and some of the coolant piping. so all new gaskets and such.

The problem is it has what i assume from the sound a Vacuum leak i tore it back down stopping at the lower intake and found a injector seal broken.

Question: Would this broken injector seal cause a bad intake leak which would in turn cause the IAC valve to idle the engine up to 1700 - 1800 rpm?

I did the whole testing procedure in the service manual and found that the IAC is good and there is no carbon build up within. When you unplug the IAC Idle drops to about 800 - 1000 and sounds good and runs smooth. Voltage from ecu signal matches the voltage from battery.

I just don't want to pull the lower intake back off since the gaskets get a bit pricey but the torque has been performed correctly according to the factory service manual. The seal is the only thing i can see that would be an issue and its only one.

Any suggestions or answer will be greatly appreciated.

PS I am referring to the Factory Service Manual for this.. With the TSB section change.
PS again: Sorry if the first line seems kinda rude, I meant i am a member here and owner only of RBV's so here is the best place, Besides i trust fellow ford owners over anyone else

 

[martin]

A little more information might help, like what motor is it?

 

[alyssasdaddy]

Its a 99 Nissan Quest with the 3.3 in it.. Its a Ford chassis with a Nissan Motor what else would you need to know?

 

[bobbywalter]

injector seal leak is a leak.....

 

[gribly]

^^ I agree with captain obvious. In the future, whenever you have something apart and find something wrong with it, for you own sake, please fix it.

 

[alyssasdaddy]

Well i replaced all Injector seals and the problem did not go away, So i am thinking its something else. Let me explain:

I changed the Knock Sensor on a 99 Nissan Quest which requires you to removed the upper intake, Lower Intake (and all attached) and some coolant crossover tubes. I did all this put it all back together and all was running beautiful smooth, started perfect etc etc.

I let it sit for day and went back to find the issue with the o2 heater circuit found that and repaired 3 wires that were cut / broke and started it back up. since then it has been at a high idle. I traced the high idle back to the IAC which is causing it to do it, I unplug it and all is normal. It also now has a starting issue which is you have to give it gas to get it to start once its running though it is all smooth and runs good no CEL except for the IAC which i unplugged so of course its going to give it.

I am not new to working on cars i have a lot of repairs behind me, from simple to full rebuilds. so i have put some motors together.

I know this is a nissan question but hopefully there is a general mechanic that has had experience with this problem cause i am stumped. No intake leaks that i can find i have sprayed ether, carb cleaner at all mating surfaces to see if it suck it in and cause the engine to tell me more but no luck.

 

[alyssasdaddy]

It was not an injector seal and its not an intake leak i figured it out with about 3 days of internet research on the subject.. Nissans require a idle relearn when you clean the throttle body and since i pulled it all apart and cleaned throttle body i messed up the whole idle air, engine idle, and throttle blade blah blah nissan sux.

Tomorrow i will be heading to the dealership to have this fixed by some proprietary software by the name of Nissan Data something or Consult and it will probably cost a lot wish there was a non consult way to do this but i don't have the "OBDII PC Interface" i can get the software for free just not the cable.