Engine Performance problem
2004 Nissan Sentra 4 cyl Four Wheel Drive Automatic 106724 miles
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Hello, my car got overheated and the car wouldnt start. After diagosis engine head had a crack and water and oil was mixed up. Since i got a used engine which has done 24000 miles at the same price to fix the head gasket/head, the mechanic replaced the engine. I drove it for couple of miles and the service engine soon light came up. Also the O/D light blinks when i start the car and turns off while driving. The car stalls to exceed 40mph. The mechanic checked and said the car is good and wanted me to drive for a few miles since the engine was replaced. the computer didnt show any error codes. what is the issue here?

i think the main issue is the mechanic doesnt want to stand behind his work. driving it for a while isnt going to fix anything. if you go to autozone and get the computer scanned(they do it for free) give us the code numbers and we can go from there

i checked with autozone and they said that the computer isnt shoing up any errror. they suspect some loose wiring and hence no error codes. Moreover they said that the first thing would be to change the spark plugs and then check if the pickup is good. Pls advise .

that diagnosis i can tell came from the guy from autozone. have we tried having the previous mechanic look at it again? no communication is probably from a blown fuse. give the guy another shot and get back to us

Hi..i took it back to the mechanic..he diagonised the car for a whole day. He sad spark plugs are good, o2 filter good, fuse is good. but he coudnt find out why the SES is on and the car has a low pickup. The computer doesnt show any error codes. He feels that nissan dealer would be able to help me. Pls advise.

you can get a diagnosis from them. only commit yourself to 1 hour of diag time so your not locked in.

Nissan checked and gave me a report tht the throttle actuator needs to be replaced. i asked them if this is fixed then will my car run good and no SES. They said thts wat the comouter shows to fix NOW. I took to my mechanic and i told my him about this. He showed me the new throttle actuator tht he replaced new when he put the engine. He showed me the old one tht was in his junk along with my old engine. He believes tht the computer chip needs to be re coded or something. Since he has checked the pressure in the fuel pump, the transmission is good and others as i mentioned.Nissan is asking me 400 to replace the throttle which is already new. They said if i got it fixed from my mechanic they would charge me again 99 bucks to re-program it. Pls advise.

im confused what you are calling a throttle actuator? is it a throttle position sensor?

Yes, its something at the right hand top corner of the engine. The report calls it throttle actuator to be replaced in the first page of the report. also there are the codes tht Nissan gave a copy to me and said tht replacing this Throttle woulf eliminate these codes. Thing is i already have a new one in the car. So would a re-programming the chip get the SES to go off?

Self Diag Results

DTC results Time
ETC functioning/circ 6
P1122

ETC functioning/circ 6
P1122

ETC ACTR 0
P1121

TP Sen 1/CIRC
p0223 6

TP Sen 2/CIRC
p0223 6

TP sensor
P2135 6

Int/V TIM V/CIR-B1 1t
P1111

CMP Sen/circ-B1 1t
P0340

ETC ACTR
P1121 1t

Hello Car pros,

Do u have any advise for me plesssssssssssss?