10 replies to this topic

[zimmer]

Hi all - went to start the car this morning and it's misfiring badly. I've had 2 misfire episodes over the last month or so, both of which cleared with a bit of revs, so thought little of them. Unfortunately at the moment it's undriveable, but not sure if it's on 2 or 3 cylinders. Water ingress I thought, as there are signs of corrosion in the spark plug wells of cylinders 1 and 2. Changed spark plugs - no difference. OBD shows p0202 - have searched and this means a duff injector, or bad circuit in the injector. However, could this just be the coil pack? Would be grateful for any help - does a knackered coil pack bring up 0202? If so is there anyone in the north east with an NA might be able to pop over and let me try their coil pack before I shell out on a new one? If not, is it a DIY job to change the injector (I'm not particularly mechanical), and does anyone have any spare? Cheers Rich

[chris_uk]

What does that mean?
P0202 means that the PCM detected a fault in the injector or the wiring to the injector. It monitors the injector and when the injector is activated, the PCM expects to see the voltage pulled "low" or close to zero. When the injector is switched off, the PCM expects to see a voltage that is close to battery voltage or "high". If it doesn't see the expected voltage the PCM will set this code. The PCM also monitors resitance in the circuit. If the resistance is excessively low or high it will set this code.

Symptoms
The symptoms for this code will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated.

Causes
The causes of a P0202 engine light code could be any of the following:

-Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
-Open in the wiring to the injector
-Short in the wiring to the injector
-Bad PCM

Possible Solutions

-First, using a DVOM check the resistance of the injector. If it isn't within specs, then replace the injector.
-Check for voltage at the fuel injector connector. It should have 10 volts or more.
-Visually check the connector for damage or broken wires.
-Visually check the injector for damage.
-If you have access to an injector tester, activate the injector and see if it operates. If the injector operates, then you likely have either an open in the wiring, or a blocked injector. If you do not have access to a tester, swap the injector with another one and see if the code changes. If the code changes, then change the injector.
-At the PCM, remove the driver wire from the PCM connector and Ground the wire. (Make sure you have the correct wire. If you're not sure, do not attempt) The injector should activate
-Replace the injector

[FLD]

I've got a few injectors lying around if you need one. Dead easy to change.

[zimmer]

Cheers guys, I've bitten the bullet ad am sending it into the garage, messing around with the fuel rail is one step beyond me i think. May take you up on your offer FLD, I'll see what the garage want for a new injector, have read they're available for about 90 quid, or 190 for a new fuel rail with all 4. Thanks Rich

[old codger]

If its not injectors, and is a coil pack problem, I have a spare that you can try. Just give me a pm if thats the case. Good luck.

[FLD]

Cheers guys, I've bitten the bullet ad am sending it into the garage, messing around with the fuel rail is one step beyond me i think.
May take you up on your offer FLD, I'll see what the garage want for a new injector, have read they're available for about 90 quid, or 190 for a new fuel rail with all 4.

Thanks

Rich

Just let me know if you need one. 90 quid is a bit steep!

[zimmer]

Thanks guys - unfortunately got the car towed by the aa to the garage today. Half way the towing eye sheared off and the towing assembly from the van bounced up and left a hole in the front of my clam. Full story with pics to follow.... May still be up for both a coil pack lend and injector though, will keep you posted - thanks again, going to go have a stiff drink now....

[FLD]

Feck! Hope the AA put a new clam on it for you then! Dont fret too much these things can be put right, keep us posted. Injectors for cheap http://cgi.ebay.co.u...=item2559bff41c

[zimmer]

Hi guys I'm after some more advice if possible - my misfire saga continues! Since the above posts, it's been into the local lotus specialist, who told me it wasn't the injector but the ECU. After getting a second hand ECU from Fab, along with a new coil pack, it turned out they were talking rubbish and finally put a new injector in. This worked for a while, but then the misfire started again - they had damaged the connector on injector 1, so I got hold of a second injector and put that on. Again solved the issue for a while. Now its started intermittently dropping onto 3 cylinders again. It'll do this when warm, driving normally then come to a stop and idle. It'll start misfiring, but will clear if I give it a bootful of revs. Then it'll run fine for a bit then the cycle will start again. Spark plugs are only a couple of months old Swapped back to old coilpack - no good so new one back on. New coolant temperature sensor, no joy Put 4 new injectors in today - it runs better but is still dropping a cylinder sometimes. ECU reset My EGR was blanked and rotated previously - I've put it back on and that makes no difference either There are no fault codes logging on my OBD reader, EML and fan remain off My next plan is to put my old ECU back on, as Fab's is actually older with more miles on than mine. However it's a bit of a faff. Also going to check out the exhaust manifold - could a hole in this cause running issues like this?? Compression test also would be an idea? Then I guess its cam cover off and check the timing chain (seems unlikely source of the problem) Any ideas guys, this is driving me insane!

[cramman]

Let me know if I, or any bits from my car can help.

[NickB787]

one thing I would suggest is when it's running rough get your hands on the injector loom (plastic rail) and move it, it's possible you have a wiring issue also check the other looms as well.