Poor idle – too rich - why?

Zaphod · 03-06-2021, 11:14 AM

Hey there ya´ll, I need help.
My bike is a AJP PR5 from 2016 with a Zongshen 250 and a Delphi MT05.

When cold the engine starts up just fine (no throttle) but stalls after less than a minute. After that it needs opening the throttle to start again, to get warm I constantly need to keep the throttle open.
When warm the engine starts up just fine but after less than a minute it idles poorly.

I´m using the HUD ECU Hacker and this is what irritates me:
1. The O2-Voltage is always high, the ECU never runs in closed loop, even when the coolant (= engine) temperature is above 55°C.
2. When idling warm, the actual rpm doesn´t meet the target rpm, it´s always below target rpm. Isn´t the ECU supposed to change (whatever) parameters (air, fuel injection, spark,...) to meet the target rpm?
3. I get the fault code P0650 - Fault lamp (MIL) malfunction, but not anything specific. After erasing the code it comes on again shortly after. I cannot find the reason why. Tried to find any correlation to the behaviour of other recorded parameters (mainly through looking at the graph in HUD ECU Hacker) but cannot find anything.

I constantly reset the ECU (2 minutes on + 1 minute off) before testing/after changing something.

I think that the engine is running too rich but don´t understand why…
O2-Sensor is new (and supposedly working), also new: MAP/MAT sensor, IACV, ECU (!)
Injector is almost new, should be working fine.

Waiting for a new TPS, it´s working but only goes to 80% when throttle fully open…(?)

Any suggestions greatly appreciated, big thanx in advance.
Zaphod

Zaphod · 03-06-2021, 11:30 AM

For the ones of you who use the HUD ECU Hacker I uploaded a .xml file (had to zip it in order to upload it, sorry)

1. starting the engine - the rpm is a little higher than target rpm - rpm goes down below target rmp into poor idle
2. shut of with emergency switch

I repeated that a few times

digitaly · 05-20-2021, 08:01 AM

Have you solved it? I have the same problem with a 2016 EFI version.
Could not be the valve clearance?

Pst8 · 03-07-2024, 08:46 AM

Woow
I got the completly same problem even the same fault code
You got any fix or information?

03-06-2021, 11:14 AM	#1
Zaphod Join Date: Mar 2021 Location: Germany Posts: 2	Poor idle – too rich - why? Hey there ya´ll, I need help. My bike is a AJP PR5 from 2016 with a Zongshen 250 and a Delphi MT05. When cold the engine starts up just fine (no throttle) but stalls after less than a minute. After that it needs opening the throttle to start again, to get warm I constantly need to keep the throttle open. When warm the engine starts up just fine but after less than a minute it idles poorly. I´m using the HUD ECU Hacker and this is what irritates me: 1. The O2-Voltage is always high, the ECU never runs in closed loop, even when the coolant (= engine) temperature is above 55°C. 2. When idling warm, the actual rpm doesn´t meet the target rpm, it´s always below target rpm. Isn´t the ECU supposed to change (whatever) parameters (air, fuel injection, spark,...) to meet the target rpm? 3. I get the fault code P0650 - Fault lamp (MIL) malfunction, but not anything specific. After erasing the code it comes on again shortly after. I cannot find the reason why. Tried to find any correlation to the behaviour of other recorded parameters (mainly through looking at the graph in HUD ECU Hacker) but cannot find anything. I constantly reset the ECU (2 minutes on + 1 minute off) before testing/after changing something. I think that the engine is running too rich but don´t understand why… O2-Sensor is new (and supposedly working), also new: MAP/MAT sensor, IACV, ECU (!) Injector is almost new, should be working fine. Waiting for a new TPS, it´s working but only goes to 80% when throttle fully open…(?) Any suggestions greatly appreciated, big thanx in advance. Zaphod Last edited by Zaphod; 03-06-2021 at 12:32 PM. Reason: add information
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05-20-2021, 08:01 AM	#3
digitaly Join Date: Aug 2020 Posts: 24	Have you solved it? I have the same problem with a 2016 EFI version. Could not be the valve clearance?
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03-07-2024, 08:46 AM	#4
Pst8 Join Date: Mar 2024 Posts: 1	Woow I got the completly same problem even the same fault code You got any fix or information?
	0