Question about Harley Davidson XL 1200 S Sportster Sport Motorcycles

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1990 Sportster backfires when it cold for tem mins

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Sounds like the valves or timing needs adjusted. Have you checked either of them?

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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Check the condenser fan. #1 problem with refrigerators. It is in the rear, low, behind the lovely cardboard panels. Try not to tear the cardboard. Duct tape will patch it, if you do.

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2000 sportster front cylinder backfires


There is probably a small leak in the intake tube to that cylinder. Remove and carefully inspect and reinstall carb and induction manifold.

Apr 09, 2014 | Harley Davidson XL 1200 C Sportster Custom...

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2000 sportster front cylinder backfiring


Hi Anonymous, could be, do a compression test, also you could have a bad ignition module or ignition coil. Good luck

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2000 tundra v6 5-speed cold start truck runs great, park it for 20-30 min it will start fine but after going 1/4 mile it dies, looses power. pull over and it will backfire and sputter until it eventua


bad need of a tuneup? like new spark plugs, ?
172 , is 02 rich/ lean warning. this one is low oxy for rich.
this code can just be a victim. for sure , with misfire.
means 02 sensor stuck at rich,
what is water temp in engine coolant, at failure? less than 150F?
could be lots of things.
leaking injectors, bad fuel.
injector sticking> causing misfire.
id use a scan tool and watch all sensor when it fails.
too high fuel pressure.
misfires cold, but only luke warm cold starts not fully cold.

just one DTC, no P0300 or 30x misfire codes, not even P0300 pendings?

Jan 31, 2014 | 2000 Toyota Tundra

1 Answer

My 2003 1200 sportster backfires starting from cold and is hard to start when hot


Hi Anonymous, and the usual supects are:
1. Spark plugs are in bad condition, improper gap, partially fouled.
2. Spark plug cables in bad condition.
3. Battery nearly discharged.
4. Loose wire connection at one of the battery terminals,coil, or plug between the Ignition Control Module.
5. Throttle controls not adjusted correctly.
6. Water or dirt in fuel system/tank
7. Water or dirt in carburator.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricking fuel flow.
10. Inrichner valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
For a possible prime suspect please visit the website below and good luck:
Harley Davidson Sportster error codes and how to access them

Sep 23, 2012 | Harley Davidson XL 1200 C Sportster Custom...

1 Answer

My 1990 Harley sportster 1200 is backfiring and won't idle without backfiring can you help?


Hi Anonymous, popping, coughing, spitting, or backfiring through the carburator or induction module is usually caused by air getting sucked in combustion chamber do bad intake seals leaking. Leaking exhaust gaskets can also be suspect. Remove air cleaner and backing plate, while engine is idling spray WD-40 or Brake Kleen around intake manifold to head area, if RPM's increase you have an intake leak and seals need to be replaced, also spark plugs will be burning whiter than normal. Good luck

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1 Answer

99 sportster 883, backfiring


sound's like the carb is set to ritch, ther should be an adjustment on or just under the carb it's self

Jun 05, 2010 | 1993 Harley Davidson XLH Sportster 883

1 Answer

1990 dodge 360. Runs fine. unpredictable backfire


You want to check your timing for accuracy and then check all plug wires for burned or cracked ends. Also check the single coil tower where the coilwire connects for very small cracks. Then check the inside of the disrtibutor cap for the same small cracks. Throughout this process I'm certain you'll find the culprit. Thanks, Dana

Jan 30, 2010 | 1990 Dodge W250

1 Answer

Inside tem. can not reach the set tem. during the cool days


check the presure switch jump it out and see if it fires all the time

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