engine starts then shuts off

[llama_of_doom]

hi I have a 91 240sx with a 95 motor that I swapped into the car. Its been sitting for a while as an unfinished project but I finally went to start it today and I got it started after several cranks and it bogged up into life the RPM's went to 1,000 and then after about 10 seconds it died it repeated this after maybe 10 more attempts to get it going. I tried holding down the gas pedal and starting it and it started and ran longer like 30 seconds but this time it idled at only about 500-700 rpm. I thought it could just be a flooded engine from all that cranking so I held down the gas pedal on that one attempt and tried to start it that way my friend claims it would shut off the injectors from firing more fuel incase its flooded that way it would just use whats already in the engine. Also my vacuum lines are not correctly attached to where they are supposed to be going but a friend of my claims it doesn't matter the car should start and run regardless, just run really crappy. He told me by disconnecting the maf would sort of bypass the vacuum lines and I did try starting it with the maf disconnected but it didnt change anything any ideas?

[James@CI]

Contact me over AIM screen name sr20detswaps I will help you out more over it.

[240sxuBerNOOB]

could be a bad knock sensor. sounds like similar simptoms

[llama_of_doom]

but wouldnt I get a code for it then? because I am not

[240sxuBerNOOB]

hmmmm, i believe you should but i mean it wouldnt hurt to replace the sensor. but then agin it could be a bad ground or suming tihng lame liek that

[Malefic]

i'm going to say fuel pump.. get the carpet out of the trunk, and look at the wiring to the fuel pump, i had to soder mine back onto the connector when i first bought it, i had the same problem. clean out youre fuel filter too while youre at it. its located on the top left side of you're motor.-Malefic

[CRyan]

but wouldnt I get a code for it then? because I am not

No - the Consult II or III will not pick it up as a check engine light code - but if you CAN get a hold of one at your nearest Nissan dealership - ask them to run it and see if any knock sensor has been deployed and how many times.

[a.momo]

Im am having the exact problems with the same set up

I have a 91 240sx with a swapped ka from a 95

I thought at first i had a clogged cat ....replaced with a res....still does itThen i thought it was my fuel..replaced filter, pump, strainer....still wont run for more than ten seconds...

i would love to know what the problem is aswell