Hot weather - pants running???
Discussion
My Chim 500 is hesitating and stuttering a lot lately. I fitted a new rotor arm, dizzy cap and leads yesterday as they looked a bit tired, but to no avail.
Yesterday it was behaving particulalry badly (in the heat) but late last night when coming back from our TVRCC meet, it ran 90% better! The air was a lot cooler and it barely missed a beat.
Am I right in saying there is no air temp sensor? Would the air flow meter cause this if it was out of adjustment? If I were a betting man I would say this feels like a fuelling problem rather than ignition.
Best of all, it's quite intermittent, happens at part or full throttle, low or high revs and now and again, not at all.
I'm absolutely stumped on this one, so any ideas would be very welcome!
Yesterday it was behaving particulalry badly (in the heat) but late last night when coming back from our TVRCC meet, it ran 90% better! The air was a lot cooler and it barely missed a beat.
Am I right in saying there is no air temp sensor? Would the air flow meter cause this if it was out of adjustment? If I were a betting man I would say this feels like a fuelling problem rather than ignition.
Best of all, it's quite intermittent, happens at part or full throttle, low or high revs and now and again, not at all.
I'm absolutely stumped on this one, so any ideas would be very welcome!
morebeanz said:
I don't know how reliable the fuel pump is, but my old TR6 was terrible in the heat due to low fuel pressure. Might be worth taking a look?
Best of luck!
'Best of luck!
That was caused by fuel vaporising in the pump.
The pump relied on cool petrol to take heat away in the return line to the tank, but this was marginal.
The TR6 pump was located inside the car near the tank without cooling air flow.
Whenever the weather was hot and the fuel was down to the last couple of gallons, the temperature of the petrol got too high.
This was easily fixed by addition of a cooling coil around the pump body. The fuel return line was cut and run through the coil. That increased the amount of heat removed.
Keeping the tank at least 1/4 full provided the required heat sink.
Once a coil was fitted, that problem never happened again.
Fester
penguinspang said:
I had a similar issue recently, turned out to be a faulty temperature sensor that wasn't showing up on the standard diagnostics. It was causing it to run well over-rich... Might be worth a look
Was this the temp sender that feeds the ECU? I only ask as I had my plugs out yesterday to check the gaps and they were quite black, indicating of course a rich mixture. Is there any way of testing it?Nick
Uncle Fester said:
morebeanz said:
I don't know how reliable the fuel pump is, but my old TR6 was terrible in the heat due to low fuel pressure. Might be worth taking a look?
Best of luck!
'Best of luck!
That was caused by fuel vaporising in the pump.
The pump relied on cool petrol to take heat away in the return line to the tank, but this was marginal.
The TR6 pump was located inside the car near the tank without cooling air flow.
Whenever the weather was hot and the fuel was down to the last couple of gallons, the temperature of the petrol got too high.
This was easily fixed by addition of a cooling coil around the pump body. The fuel return line was cut and run through the coil. That increased the amount of heat removed.
Keeping the tank at least 1/4 full provided the required heat sink.
Once a coil was fitted, that problem never happened again.
Fester
Had many years of problems with mine, replaced everthing in fuel system by the time I sold the car, new tank, new metering unit, new injectors, threw away lucas pump and fitted Bosch pump under wheel arch.
CaptiV8ed said:
penguinspang said:
I had a similar issue recently, turned out to be a faulty temperature sensor that wasn't showing up on the standard diagnostics. It was causing it to run well over-rich... Might be worth a look
Was this the temp sender that feeds the ECU? I only ask as I had my plugs out yesterday to check the gaps and they were quite black, indicating of course a rich mixture. Is there any way of testing it?Nick
On the otherhand they cost about £20 so you could just buy one and see what happens.
According to "the bible" its not unusuall for them to cause problems.
Ah Jesus!
This weekend I have been mostly changing fuel pump and filter and earlier today, I discovered that the earth lead at the back of the n/s head was really loose! Some clown (alright, it was me) forgot to tighten it up properly before.
I hastily tightened this earlier and took it for a spin - amd quick as a flash - f*&k all difference. Bloody hell!
I've got it booked in at my local(ish) indie week after next - earliest they could do it. So it seems I'll just have to sit it out. I really have nothing else left. I'm in no position to monitor what the fuel pressure is doing so that's me done.
I am beat. An empty shell of a man. I shall hang up my spanners and call it a day. A sad, sad, day indeed.
This weekend I have been mostly changing fuel pump and filter and earlier today, I discovered that the earth lead at the back of the n/s head was really loose! Some clown (alright, it was me) forgot to tighten it up properly before.
I hastily tightened this earlier and took it for a spin - amd quick as a flash - f*&k all difference. Bloody hell!
I've got it booked in at my local(ish) indie week after next - earliest they could do it. So it seems I'll just have to sit it out. I really have nothing else left. I'm in no position to monitor what the fuel pressure is doing so that's me done.
I am beat. An empty shell of a man. I shall hang up my spanners and call it a day. A sad, sad, day indeed.Gassing Station | General TVR Stuff & Gossip | Top of Page | What's New | My Stuff