ca falling on it's face...Help

Post by **ca18donny** » Thu May 12, 2005 9:06 am

I have a 90 240sx with a CA18DEt swap in it and I am having some trouble with it that I thought that you all could possibly help me with.The trouble is when the R.P.M's reach around 4000 it feels like the carjust falls on its face and dose not make any power.It pulls hard until 4000 R.P.M.Thank you in advance for any help or sugestions

Post by **float_6969** » Thu May 12, 2005 9:22 am

Is the detonation sensor hooked up?

Post by **Sir. Driftalot** » Thu May 12, 2005 12:36 pm

i had the same sort of problem

turns out my 02 sensor wiring was damaged aswell as water temp sensor was corroded

might be somthign to go over

Post by **vis213** » Thu May 12, 2005 4:31 pm

i have the same problem

as soon as i get to 4.5k it feels like the motor tripped and the RPM fly over to redline

float: where would the detonation sensor plug be? i bought the car with the motor in it and there are various plugs lying around

Post by **biosehnsucht** » Thu May 12, 2005 8:20 pm

wait so you see your tach go to redline when it happens? sounds like bad CAS signal and the ECU suddenly thinks you've done some crazy RPMs

Post by **buffy** » Thu May 12, 2005 10:22 pm

Is your vac line to the fpr OK?

Post by **themadscientist** » Fri May 13, 2005 12:26 am

sounds like a fuel delivery problem. Is the loss of power accompanied by a very rapid stumbling? I has a GTS-4 that did the same thing and the pump was weak.

Post by **float_6969** » Fri May 13, 2005 1:23 am

Did he die?

Post by **ca18donny** » Fri May 13, 2005 4:06 am

Thanks for the input. I will check the o2 sensor and water temp sensor when I get home today.I thought it might be something with the o2 because it runs very rich all of the time.

Post by **F3600** » Fri May 13, 2005 6:49 am

is it boosting fine.. ? Mine was boosting till 5-6 psi and the car was getting a big power drop like hitting a wall .. it was a boost leak.. check all your piping

Post by **ca18donny** » Fri May 13, 2005 6:59 am

it is boosting up to 10 psi and holding there.It reaches 10psi at around 2500rpm and pulls strong until it hits about 4000 then it feels like just loses power.

Post by **Nunook** » Fri May 13, 2005 7:40 am

dont the injectors start to batch fire at 4000?

i would guess its a fuel prob.

Post by **fallen180sx** » Fri May 13, 2005 7:45 am

maybe a boost leak

Post by **ca18donny** » Fri May 13, 2005 9:22 am

thank you all for your input .I am going home tonight with a list of things to start checking and ruling some of them out.hopfully by monday I can have it fixed

Post by **float_6969** » Fri May 13, 2005 7:22 pm

Keep us updated please. It's good info for the archives when solutions to problems are found.

Post by **ca18donny** » Mon May 16, 2005 1:36 am

This weekend I went over every thing except the pump.I talked to a local guy that works with sr's and rb's and he seems to think that my fuel pump is not suppling enough when the car hits batch fire.So that will be my next thing to change when I get the cash for it.

Post by **boost_boy** » Mon May 16, 2005 1:44 am

ca18donny wrote:I have a 90 240sx with a CA18DEt swap in it and I am having some trouble with it that I thought that you all could possibly help me with.The trouble is when the R.P.M's reach around 4000 it feels like the carjust falls on its face and dose not make any power.It pulls hard until 4000 R.P.M.Thank you in advance for any help or sugestions

The most important thing that seems to have been over-looked is running a diagnostic on your ecu. Until you do that, you'll be probing your car for all the suggestions that these fine CA gurus came up with. I'm sure if you check your ecu, it will tell you what you did wrong. My guess is your car is not grounded correctly, which slows the fuel pump, which also weakens the ignition in the higher rpm range that makes nearly impossible to completely burn the fuel. When you see the tach flying all over the place like that, it's usually ignition or ground related; but you can't rule out all of the other factors as well.

Dee

Post by **ca18donny** » Mon May 16, 2005 3:43 am

I have done the diagnostic on the car and it came back clear.My rpms are not flying all over the place they go through the normal motions.I did not think about the grounds but I will check them tonight.

Post by **ca18donny** » Wed May 18, 2005 3:44 am

I used a wide band on the car yesterday and it is leaning out at about 3700 rpm so i am pretty sure that it will end up being the fuel pump but I still have to test the fuel pressure tonight.If I need to replace the fuel pump is there any recomendations on the one that I should get and where is a good place to get one from?

Post by **nnkfws333** » Wed May 18, 2005 4:02 am

Most people usually get a walbro fuel pump on ebay for cheap ($90 shipped) but also other people use 300ZX fuel pumps as well. People have there own opinions on the walbro but I never had one problem with mine in my SR.

Post by **ca18donny** » Fri May 20, 2005 6:06 am

Problem solved.It was the fuel pump.Thanks to all that supplied information.

Post by **mbmbmb23** » Tue May 24, 2005 6:27 pm

nnkfws333 wrote:Most people usually get a walbro fuel pump on ebay for cheap ($90 shipped) but also other people use 300ZX fuel pumps as well. People have there own opinions on the walbro but I never had one problem with mine in my SR.

Best price I've ever seen on ebay, $69 + $10 shipping.http://cgi.ebay.com/ebaymotors...=WDVW

Post by **vis213** » Wed May 25, 2005 7:00 pm

was th

ca18donny wrote:Problem solved.It was the fuel pump.Thanks to all that supplied information.

was the fuel pump crapped out? if so mine might be the same, i might try the pump out of my friends wrecked 89

ca falling on it's face...Help

ca falling on it's face...Help

Re: (float_6969)

Re:

Re: (buffy)

Re: (ca18donny)

Re: (F3600)

Re: (Nunook)

Re: ca falling on it's face...Help (ca18donny)

Re: ca falling on it's face...Help (boost_boy)

Re: (nnkfws333)

Re: (ca18donny)

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