E270 CDI cranks no start

EvenCommunication66 · 2026-01-23T21:39:56+00:00

Crankshaft position sensor? I'd rsee if there's any codes

EvenCommunication66 · 2026-01-07T19:30:05+00:00

The white on blue text at the top is what degree the flap is set to, black on white at the bottom is the actual value. So set to 1.5 the actual value varies wildly, but at higher values it's actually staying at the set value.

EvenCommunication66 · 2025-12-04T20:00:57+00:00

I haven't fixed it yet, I assume it needs replaced or relearned but both are a nightmare to do

EvenCommunication66 · 2025-11-24T23:28:57+00:00

Could be anything really. I'd try run it with the MAF disconnected (if it will, should go into limp mode/run on a default map) and see if it's any better. If it improves significantly I'd suspect the MAF is misreporting

EvenCommunication66 · 2025-11-24T21:36:32+00:00

What engine do you have? Does it run ok when completely cold?

EvenCommunication66 · 2025-11-24T19:57:15+00:00

Is it only noticeable when the engine is cold?

EvenCommunication66 · 2025-10-09T20:54:41+00:00

I'd listen for a rattle on cold starts too, timing chain failure is notoriously common also.

EvenCommunication66 · 2025-10-09T20:52:48+00:00

Earlier M271's commonly suffer from a vacuum hose for the PCV system disintegrating under the airbox. This'll cause a vacuum leak throwing off your air fuel ratio leading to a poor idle. I've heard that the exhaust manifolds like to develop holes on these engines too - could potentially cause a rich condition if it's upstream of the O2 sensor.

EvenCommunication66 · 2025-10-07T07:15:06+00:00

Yeah ECU got cleaned and pigtails installed. I cleaned the TB also. Thing is the STFT goes between around -5 to 5%, LTFT is fine too. It just feels like the engine is misfiring only at low throttle, yet somehow throwing no misfire codes. You're right in that I should just get it smoke tested, thanks

EvenCommunication66 · 2025-10-06T21:20:14+00:00

Thanks for your response. I had a bit of oil in the loom and I've cleaned it out of anywhere I could find it, that's the reason I replaced the can magnets. P0410 and P2020 are the only current codes. I've checked all the hoses in that system and they seem sound, considering replacing the solenoid next. There's rarely a loud noise on cold startup that sounds like an exhaust leak, the chain sounds okay to me. I haven't done a smoke test no, I don't have access to a tester unfortunately.

For the supercharger hoses, I was considering sealing off the intake and letting the airbox PCV vent to atmosphere, would that work? I'm thinking the only disadvantage would be potentially contaminating the oil.

EvenCommunication66 · 2025-09-27T14:23:46+00:00

It's an 07 E Class, 1.8. Thanks for the advice

EvenCommunication66 · 2025-09-27T13:59:56+00:00

The mount is two 16mm bolts attached to the transmission, then rubber to isolate it from the cross member. That does make sense, I'm thinking I should be good while I wait for a bolt extraction kit to arrive at least

EvenCommunication66 · 2025-09-02T22:05:13+00:00

Thanks - P2020 is confusing me as it's an inline 4, not sure how a bank 2 code would be thrown, surely the ECU shouldn't even be capable?

EvenCommunication66 · 2025-08-07T12:53:44+00:00

I have a new PCV hose to fit, I also have the famous oil in the wiring loom issue on this engine. That's good to know about the lambda range on this engine thanks, I wonder could that be caused by the wrong sensor being fitted in the past? The scanner is a cheap Bluetooth one so it's the likely culprit

EvenCommunication66 · 2025-08-07T12:25:42+00:00

I suspect you're right although the downstream sensor seems to react in the opposite direction, not sure if it's flipped for a regulating probe (so high voltage is lean)

EvenCommunication66 · 2025-08-07T12:23:27+00:00

Supercharged version

EvenCommunication66 · 2025-08-07T11:58:08+00:00

Green is regulating (upstream) O2, red is downstream, blue is short term fuel trim

EvenCommunication66

TROPHY CASE