code 52 struggles.

[Turbo Habanero]

So I have a code 52 ever since I did my hg job (finished about 2 weeks ago)

I re wired the knock sensors with new clips and no luck next I'm putting new sensors in.

But out of curiosity is it possible that code 52 can be thrown because I really do have detonation?.

Other behaviours I've been having is the idle sometimes sticks at 10afrs until I blip the exhaust then returns to normal.

My boost is only at 6psi but sometimes the car will seem like it misses under boost. Some feeling I got when my fuel pressure was too high.

Other then this I have codes 41,52,31 and other then that car droves fine no overheating.

 

[easternguy2005]

You wired them with clips ? I had same 52 issue. Very sensitive wiring. Use stock plugs (got mine used) that plug into knock sensors. Plenty of black tape and keep wire length stock. Doubt knock sensor is bad. Havent had a problem since.


Never heard my supra knock (except rk long long ago...)

 

[Turbo Habanero]

Yeah I definitely don't have rod knock. Just a slight tick.

I figured that knock sensors was for detonation or pinging.

 

[Turbo Habanero]

OFF TOPIC but i didn't want to make another thread for this one question.

I have a 1989 7mgte/5speed (Grey plug) and found a 1990 7mgte/Auto engine Harness is it plug and play for the 1989 ? If not what needs to be modified ?

 

[supraguy@aol]

Dunno about the harness question, but as for detonation- i dont think that would cause a code 52. The code identifies a fault in the system. I would check continuity of the signal lead to the ecu on each one, then check continuity to ground on each shielding wire, and make sure that you have zero continuity from the signal wire to ground. As mentioned, i wouldnt look at the sensor itself as the culprit just yet.

 

[Turbo Habanero]

but as for detonation- i dont think that would cause a code 52. The code identifies a fault in the system. I would check continuity of the signal lead to the ecu on each one, then check continuity to ground on each shielding wire, and make sure that you have zero continuity from the signal wire to ground. As mentioned, i wouldnt look at the sensor itself as the culprit just yet.

ok will do. Thankyou

 

[xCxHxRxIxSx]

Might want to check this out http://oldschool.supracentral.com/htm/knock.htm#rewire

 

[3p141592654]

Code 52 is only to indicate a fault with the knock sensor system. Detonation will not set it.

If you have code 31, your engine is running without the AFM and will be in limp mode and cannot exceed 3000 rpm. Are you sure you have that code as well?

 

[Turbo Habanero]

If you have code 31, your engine is running without the AFM and will be in limp mode and cannot exceed 3000 rpm. Are you sure you have that code as well?

Well the code is being thrown for sure. The check engine light stays on all the time once thrown.

But the car well get to redline but it seems to have a missfire or to much fuel Afrs do go to 10.0 at full throttle.

 

[supraguy@aol]

So have you fixed the code 52 yet?

 

[Turbo Habanero]

I have not :-( I actually have the whole harness out of the car because of it.

I'm not very smart when it comes to this stuff so I'm struggling quite a bit.

But i figured wiring it correctly would be easier with the harness out.

 

[Turbo Habanero]

So I purchased a new harness today after another failed attempt at re wiring the knock sensors on the current harness.

But I'm starting to wonder if this is my only problem.

I know code 52 can retard timing but what other effects can it have?

Behaviors/Symptoms that I've been dealing with since the Head gasket replacement.

Extreme power lose.

Afrs going extremely rich 10.0 and that my Aem uego just reads - - - this occurs at wide open throttle and the car has a hesitantation/sputtering as soon as the Afrs drop that low. Honestly when the sputtering occurs it feels exactly like it did when I was running to much fuel pressure.

I have not noticed any extreme amounts of black smoke under accel but there's definitely some too see if you follow the car.

No oil lose or coolant lose

Compression test checks out great still as well.

So can code 52 cause me to run stupid rich to the point the car just sputters through acceleration?

Other codes that keep getting thrown since I put this harness in also are 31,41 my Afm and TPS are recently new and I had none of these codes before taking the car apart for the BHG.

But I did switch to this harness because the clips and wires seemed in a lot better shape and it came from a car that was said to have no engine codes.

 

[supraguy@aol]

So can code 52 cause me to run stupid rich to the point the car just sputters through acceleration?

Yup.
Well, to be more specific- It's going to retard the timing way back, and you'll have poor combustion, which can cause a rich condition.

PS- Have you checked your coldstart injector? they sometimes stick open, and this will not throw a code.

 

[Turbo Habanero]

Yup.
Well, to be more specific- It's going to retard the timing way back, and you'll have poor combustion, which can cause a rich condition.

PS- Have you checked your coldstart injector? they sometimes stick open, and this will not throw a code.

I have unplugged the cold start injector and nothing changes when driving or under full boost.

So to try and be more clear.

Normal driving seems to be around 14.3 to 15.4 Afr

But as soon as I go 100% throttle its smooth until I see the Afrs drop to 10.0 then - - - and the car will start hesitation and sputtering through boost but will still get to redline. The sputtering is very well heard through the exhaust.

Only other time I've experienced this is right after I installed my AFPR and the fp was set way to high.

 

[supraguy@aol]

Wait- does it feel like a misfire? Like you're losing a cylinder?
If so, sheck all your plug wires, and make sure you didn't get any coolant/ water down in the spark valley. It'll cause a misfire under load.

 

[Turbo Habanero]

Yes it does feel like a miss fire somewhat but only happens when the Afrs hit 10.0 and the plugs are dry as can be

 

[Turbo Habanero]

Part throttle acceleration it will pull harder and smooth.

If I do a pull in 3rd or 4th from 45mph it will pull clean too until the recap get higher and the Afrs drop.

 

[Turbo Habanero]

Idle and normal driving are perfect maybe a little rich in Afrs at time but drives smooth.

 

[supraguy@aol]

Well, the low afr's might cause the misfire, or the misfire might result in low afr's(unburned fuel= rich).
What are your plugs gapped at?

 

[xCxHxRxIxSx]

could it be a small boost leak?