Hey there,
Ive recently acquired a 1990 lancer ca with a 4g61t motor transplant...
Iam currently in the process of fixing any issues with the motor, i had a check engine light did a voltmeter check on the data link connector which showed code 31 knock sensor, after some help by people on this forum ive found and replaced my knock sensor. Which had ooze coming out of it all the black soft backing was melted, so in other words it was definatly stuffed. I put the new sensor in which i bought brand new from repco, what they sold me which they said would work was a mitsubishi magna tr / ts 2.6 lt & ggalant (what it says on the box) knock sensor.
Looks the exact same, fit perfectly.
I filled the tank with 98ron fuel added octance booster as the guy i bought it from had run it on 91 unleaded...
So after connecting the battery and replacing the sensor, i turned the key, did not start engine, as before after about a min without engine on or with it on does not make a diff, the check engine light turns on.
I disconnected the sensor and it did the same thing as before....
The car seems to run fine, doesnt seem to make any noises, doesnt blow smoke, accelerates fine, does have , idle problem... as in after i run it or after i turn it on it idles at 1500 rpm after dri ing or reving engine slightly, and stopping... five seconds later idle drops to 800 rpm slowly and stays ere until i drive it or rev it agai ...
I also noticed when reving engine quickly the tacho cant keep up and at 4000 rpm stays there for a sec before jumping up to 8000 rpm if i rev slowly it works fine except it seems a slight bouncy sometimes....
Soooo my question is ....
Did i get the right knock sensor...if so what could be causing my check engine light , and how do i diagnose/repair. ... is the knock sensor sensitive to how tight it is? Does it need to be really tight? Or not really...
Could i have an electrical problem?
Whats going on with my tacho?
Any theories or answers and help would be greatly appreciated!
Thanks guys
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