Engine won't rev over 3000rpm. Any ideas.
Discussion
My 350i wont rev past 3000rpm when I drive it but will rev freely when parked. Its like it has a rev limiter fitted.
I had a problem with it misfiring last month and changed most things including plugs, HT leads, coil, ignition module, rotor arm, distributor cap, fuel pump, fuel filters and finally changed the temperature sensor and it sorted the misfire and I didn't really drive it hard so didn't notice the failure to rev freely. It starts perfectly hot and cold and idles really nice. Really need this fixed ASAP.
Any ideas or suggestions.
I had a problem with it misfiring last month and changed most things including plugs, HT leads, coil, ignition module, rotor arm, distributor cap, fuel pump, fuel filters and finally changed the temperature sensor and it sorted the misfire and I didn't really drive it hard so didn't notice the failure to rev freely. It starts perfectly hot and cold and idles really nice. Really need this fixed ASAP.
Any ideas or suggestions.
Had something like you, but not exactly....
During the time my ECU was less and less functional idle was perfect, but performance was less and less. No rev limiter type of experience, but in the end any throttle would nearly kill the running of the engine. Got an ECU to use over time: no issues, felt like a power upgrade. Had the old ECU resoldered and while waiting for it got a spare that I used until then.
After this long story, has your ECU been resoldered? If not perhaps worth to have it done and perhaps it solves the rev limiter type of issue.
Not into wedge camshafts myself yet, but missing lobes can do funny stuff and this could be one of them.
Rob
During the time my ECU was less and less functional idle was perfect, but performance was less and less. No rev limiter type of experience, but in the end any throttle would nearly kill the running of the engine. Got an ECU to use over time: no issues, felt like a power upgrade. Had the old ECU resoldered and while waiting for it got a spare that I used until then.
After this long story, has your ECU been resoldered? If not perhaps worth to have it done and perhaps it solves the rev limiter type of issue.
Not into wedge camshafts myself yet, but missing lobes can do funny stuff and this could be one of them.
Rob
Distributor and rotor combinations for RV8s are like a lottery. Had some issues tracking the right ignition parts down myself in the past. Kept the old original stuff and if it didn't run ok used these parts to rule out ignition stuff as well as after installing new 'correct' parts.
Hope you find the source of the problem quickly,
Rob
Hope you find the source of the problem quickly,
Rob
gromit wedge said:
Pretty sure its not the camshaft as it was running perfectly then one day wouldn't rev. It hasn't been getting worse over a period of time it just stops at approx 3000 rpm and then you have to change gear and it accelerates fine until it hits 3000rpm again.
If once a camshaft looses it hardness, is can wear out in less than an hours, so you can't rule it out, but it's unlikely.What happens when you hit 3k, does it just stop or start to miss / back fire.
Sounds like an over-fuelling issue, especially if its on a motorway or A road and you cannot go over 50mph...Do you have an adjustable fuel pressure reg?
Could also be the Coolant Temperature Sensor failing....if its reading backwards then will be throwing fuel in when its hot instead of cold.
Could also be the Coolant Temperature Sensor failing....if its reading backwards then will be throwing fuel in when its hot instead of cold.
See there are just so many variables to solve this which is so annoying when all you want is to have your car back :/
@mrzigazaga not sure if I have one. Can this cause fuel restrictions?
Context about my car symptoms
My car drives fine at lower revs (low speeds) and feel that the engine can only go upto 3000rpms, if I try to go more than that I can feel it hesitate little. Overall I feel its reached its max performance at 3000 rpm, which isn't right because when I bought the car I was hitting 80-100mph easily in 5 gear without any restrictions in a 6 speed gearbox and now I only get up to 90 using all gears. Like Gromit wedge mentioned once I change gear it then accelerates until I reach 3000rpm. I do feel that the power response feels different, before it would be so instant I could reach 80mph in 4th gear so easily and now I feel its like transitional power lacking performance.
I have had a diagnostic test to test the turbo which checked all good. My injector 1 injector (cylinder1) quantity at idle was -0.70 and the other 4 injectors were in above 0 to compensate the deviation. Soleniod activation on injector was also -6. Could possibly be that an injector is not injecting enough fuel at higher revs and my car is possibly running on three cylinders? But I'm not too sure if the above injector values mean a lot at idle. All I know is my car does wobble/shake when I'm at idle. I'm thinking either injectors, maf, map, or a vacuum leak ... I have had fuel, air, glow plugs and cam belt changed and still have the same issue. Probably will have to see live data when the car is underload to pinpoint exactly where the problem is.
btw I drive a 2006 Audi A3 2.0 TDI (140bhp)
If you have any other suggestions that would be greatly appreciated
eesbad said:
ThePunisher said:
btw I drive a 2006 Audi A3 2.0 TDI (140bhp)
You do realise that you are posting on a TVR Wedge board? You might have better luck on the "Audi, VW, Seat & Skoda" board... We're all a bit "old school" on here... 
Good luck!Gassing Station | Wedges | Top of Page | What's New | My Stuff