Help! car keeps bogging and engine flooded with fuel

[ORZ1989]

First of all Hi there I am new here and I have just brought my first silvia - a 1989 240sx coupe with KA24E. So here is what happening to my 240sx. I leave my car sitting on the drive way for around 1 week because I was too busy to work on her. Not until yesterday I finally have the time to take her for a spin but I realize my car has problems in accelerating and rev-matching. She kept hesitating in accelerating and the rpm won't go up even i step on the throttle. And then after I returned home my car won't fire up and I crank over the engine for several time. Then I realized the engine is flooded with fuel and I am wondering will this cause damage on the bore and piston ring when I crank over with so much fuel in the cylinder? Also is the bogging caused by bad injectors or MAF sensors? Thank you!

[Quantum-Kid]

Some may be Stiflers on here, but you bought your first 240sx not Silvia... anywho, back to the subject. Did you have such issues once first purchasing the car or did it just start? I would do a full break down of the car, I.E. check your spark plugs, wires, and distributor. Then check for fuel issues fuel pump, injectors, and electronics running the entire "fuel system" Lastly check your ignition systems. No damage should be caused by "flooding" your car once. But at the same time your car obviously has some sort of fuel/spark/ignition issue and it is not good to sit in your driveway for half an hour cranking the car and getting no results. If you dont have the know how to find/fix the issue yourself find a local Nissan owner (most of us are helpful friendly people) and see if they can help you, if that fails take it to a garage and spend a few pennies getting the issue diagnosed first. After they tell you what it is and if you feel comfortable fixing it your own I would recommend that so you get some experience working on 240's and it will also save you a s*** ton on labor cost that the garage will charge you.

[ORZ1989]

Thank you for your reply. I am planning to tow my car to my mechanic and let him inspect the car. I am suspecting i may have bad injectors but anyway i will see what the mechanic is going to say.

[SoundEfx]

Do you have a check engine light?

[ORZ1989]

The check engine light is occasionally on for 1 or 2 seconds when I am driving on freeway. I don't see the engine light in rest of the time.

[alvarez-s14]

try the fuel pressure regulator or the injectors

[SoundEfx]

Also, check your plug and wires.
It might be that you're not burning the fuel because of bad plugs or wires.

[maxdelsf]

If you didn't take it to the mechanic already, I had similar issues when the car was in "fail safe" mode before. Fail safe mode is something that Nissan did to SR engine so you can start, but it will not run properly because the air/fuel ration is jacked. The first time it happened it was a fuel pump going bad. It took me a week of reading the FSM to find out what happened. This time after a two week rebuild, it turned out to be an injector was leaking because of a bad o-ring that we didn't replace. The fail safe mode basically shoots fuel into cylinders twice during the cycle causing engine to run like poop with and acceleration and the ignition timing with be seriously advanced. This will also cause backfiring, black spots to come out of strait pipe, flooding, and serous smell of fuel, even in oil. The fail safe mode in sr20det can happen for several reasons,sensors bad (MAF, CAS), problem in fuel delivery ) injector leaking-fuel pump going out, or boost leak somewhere or coil pack is going bad or not grounded. I wish I would have read the FSM two years ago when we first got the swap.

I am not a mechanic, but just from getting familiar with FSM, I can trouble shoot problems, i have rebuilt 4 SRs, and just got done last week rebuilding my first engine by myself and runs like a champ.

below is link to FSM for SR20DET Black top (the engine portion will work on Red top stuff, because basically the same engine minus the VTC and o2 sensors) Start here in SFM: TROUBLE SHOOTING p207

http://www.nicoclub.com/FSM/240sx/S14-SR20DET.pdf

good luck