stuthegeordie
Member
Sender gauge is apparently innacurate resulting in running out of petrol today, put new fuel in and it now runs rough, loads of small backfires, any idea?
Cheers in advance
Cheers in advance
Have you checked for air leaks at the inlet manifold. Not familiar with your engine, but possible leak on the hose between the inlet manifold and the brake servo. If the intake is getting extra air it will cause backfires due to a weak fuel/air mixture. If that is all ok, check the exhaust for leaks, could be sucking air in on the overrun which will cause banging in the exhaust. Do these easy checks before looking at things like the ignition coil and its wiring. Is your engine fuel injected or carburettor?Got a chance to look at the Landy.
New plugs and rotar arm have made no effect and the accel pump diaphram looks ok. Air filter is good and it's getting a good jet of fuel. Annoying cos she was running mighty fine prior.
Thanks Wimblowdriver. Its a 2.5 with a webber carbHave you checked for air leaks at the inlet manifold. Not familiar with your engine, but possible leak on the hose between the inlet manifold and the brake servo. If the intake is getting extra air it will cause backfires due to a weak fuel/air mixture. If that is all ok, check the exhaust for leaks, could be sucking air in on the overrun which will cause banging in the exhaust. Do these easy checks before looking at things like the ignition coil and its wiring. Is your engine fuel injected or carburettor?
Turns out exactly that, took it to a Landy mechanic he recons when it was running out of fuel it would be running lean and the additional heat would be enough to crack the 30 year old manifold.Coincidence! I find it a bit difficult to imagine how running out of petrol can crack a manifold. If that was true we'd need to replace manifolds like we do with air filters. Even if it might get a wee bit hot with running on a weak mixture before it finally runs out.
Correct, it won't cause a misfire, but it will cause banging in the exhaust especially on the overrun when the vacuum in the exhaust system sucks air in through the crack.Not sure that I can believe that. In any case, a cracked exhaust manifold won't cause a misfire.
Excellent - all sorted then? New manifold?The popping, it turns out was due to the crack in the manifold sucking air and creating the pop.