90 cc chinise quad engine wont crank manualy or

When you disconnect the battery, you need to reset the security and immobilizer.

https://www.google.com/search?q=2003+Peugeot+307+cc+2.0+reset+security

Peugeot 307 P1621 Engine Trouble Code

http://p1621.enginetroublecode.com > peugeot-307
P1621 engine trouble code is about Crankshaft Position Sensor A Circuit Low Input. Reason For P1621 Code. The reason of P1621 OBD-II Engine Trouble Code is Fuel ...

P1621 and clogged DPF - Peugeot Forums

https://www.peugeotforums.com > threads > p1621-and...
Mar 26, 2021 - Hi there. I've been having some issues with my otherwise lovely 2012 Peugeot 5008 (1.6) lately. The engine-light comes on aswell as the esp ...

Peugeot 3008 Sid807 dtc p1621 after mod - MHH AUTO

https://mhhauto.com > Thread-Peugeot-3008-Sid807-dt...
Jan 24, 2019 - Today I've took the car to dealer and he says after update car still the same. Anyone know what I can try to do now? Dtc p1621 is Inchoerence ...
4 posts · Hello.maybe someone can help me. I've sid807 for fap remove. Opened ecu, read backup by pcmflash ...
Troublecode: P1621. - MHH AUTO - Page 1
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Mar 29, 2021
307 break petrol 2.0 no start. ECU Locked . - MHH AUTO
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SID807EVO Common faults? - MHH AUTO - Page 1
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From this chart - I think you may be misreading the number - 3970010 is possibly the actual number: Which makes the engine pretty old 68-72 350 V8 - 4 bolt main. I included past this number so that you can see that the number you posted doesn't actually exist. And thus my conclusion that the 9 is most likely a 0. Hope this helps. 3970010 350 69 Corvette late 69,4 bolt main 3970010 302 69 Camaro Z/28,Late 69, 4 bolt main 3970010 350 69-79 Truck 2&4 bolt main 3970010 350 69-79 Pass,Chevelle,Camaro,Nova,MonteCarlo 2&4 bolt main 3970010 350 70 Corvette 300,350,370 HP 4 bolt main 3970010 350 71 Corvette 270,330 HP 4 bolt main 3970010 350 72 Corvette 200,255 HP 4 bolt main 3970014 350 69-77 Pass,Chevelle,Camaro, Nova,MonteCarlo 2 or 4 bolt main 3970014 350 69-79 Truck 2 or 4 bolt main 3970014 350 72 Corvette late &undefined;72,200 HP,255HP 4 bolt main 3970020 307 68-73 Pass,Chevelle,Camro, Nova 3970020 307 69-73 Truck 3970024 307 69-73 Pass,Chevelle,Camro, Nova,Truck 3992386 327 68-69 Pass,Chevelle,Camro, Nova,Truck Large Jounal

I'd check the compression now, before getting involved with anything else. And double check the timing because that would explain a backfire and failure to start.

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This sounds like it is a fuel supply problem NOT an exhaust issue. It will be worth you getting a good garage to check the whole fuel system. "Back firing" is a loud bang caused by too much fuel passing all the way through the engine and exploding when it hits the hot exhaust. It is NOT very common in modern cars so get a good mechanic to check the car.

Check Autozone.com They have some schematics. I check there before I buy mine at alldata. I don't have yours or I would give it to you.

replace vac.advance or check if u have a way..... hope it helps

Have you checked the fuses? I think there are 2 ECM fuses if either one blows there will be no spark.

my guess is your timing could be off, or ^, plugs can be gaped wrong

recheck valve adjustment and timing as well as vacuum leaks