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Discussion summary
YOUR RESEARCHbackfire when step on gas peda!
Leading reported evidence
Fill with 93 octane
Suggestion or failed attempt
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Suggestion
Do you have the problem if you fill with 93 octane?
Leading evidence: 'Fill with 93 octane' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill with 93 octane' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
My car is a tip so it should change gear by itself (when in Drive mode).
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12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Sometimes if I want to accelerate while the car is cruising at low speed (around 20 to 30 mph), I'll hear a knocking sound at the back of the car with a little hesitation. My mechanic said it may be a backfire. What do you think? Have you guys experienced this before and if so how to fix it?
Is it possible you're lugging the engine? What does that translate into in RPMs when you step on the gas? If you're much below 2000 RPMs and going that slowly, the engine will not pull well in 3rd and especially in 4th. I can't remember off the top of my head what 20 mph translates into in RPM in 3rd gear, but it can't be much.
If I remeber correctly, the rpm is around 2000 or slightly below that. It doesn't happen all the time. When it happens, there will be one knocking sound at the back of the car and the car will hesitate for a second or two before it accelerate.
Bad gas maybe? Mine farts if I lift off the accelerator pedal while at low rpms (1000-1500 rpms), but it's only the intoxicating gurgling of the PSE
Do you have the problem if you fill with 93 octane?
I get the same thing even in second gear. Mine only occurs when the car is cold and I have just backed out of the driveway. I've been using 92 octane. Can't imagine 92 v 93 would cause that much difference. As far as bad gas, I've gotten gas from a number of different places - same thing.
I have been using high level octane gas so I don't think it is petrol related.
The mechanic is unable to find the cause of the rear end clunk sound when accelerate quickly during low speed cruising (it doesn't clunk all the time when accelerate). Mechanic said everything (mounts, suspension and sway bar) is tight and he is still checking to see if there is anything else which could cause the clunk.
I've seen some web saying that the noise could be from a faulty transfer box or torque converter, any views?
My car is a tip so it should change gear by itself (when in Drive mode). Since the "thump" doesn't happen all the time, I doubt that it is transmission related. Could a backfire cause a "thump" at the rear end with the car bogged down a little?
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