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Discussion Starter · #1 ·
My 2000 Rover 45 1.8 k series has got this slight running problem only for a couple of minutes after a cold startup. Absolutely fine once its cleared up and will only re-appear on the next cold start up.

If you blip the throttle there is what I call a 'dead spot' where the revs jump from about 1800 to 2000 rpm. If you drive away and the stop the revs can hunt up and down a bit, and also if you say drive down the road and lift your foot off the throttle around where the 'dead spot' is the car jolts very harshly - so you have to put your foot down on the clutch before lifting off the throttle.

Heres a vid I took: http://www.youtube.com/watch?v=5umjphbBjAs

When im revving the engine from inside the car, you can hear the engine jump revs at about 1900 rpm.

After I close the bonnet and get in the car, I move the car and at the bottom of the driveway when I stop you can hear the engine hunting.

Any ideas? Would it be possible to have a weak fuel pump when cold? Because it is a very noisy fuel pump.
 

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have you changed any of the sensors lately?

check ignition coil paks for cracks.

vaccum fault, do a butane test.

injector fault.
 

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Discussion Starter · #4 ·
Havnt changed any sensors - have cleaned some up to see if changes things though.

How do I do a butane test?


Thanks for replying.
 

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Side note:

Does your temp guage work? Seemed to be stuck at the bottom like mine was for ages. Sorted it with a sensor/switch thats located (on mine) under the fan sensor/switch.
 

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start the engine, operate the throttle under the bonnet, spray butane around the inlet manifold and vacuum hoses and quickly take the revs up. if the flat spot isn't there, you have a leak.

It most probably isn't this........................ but I have the stuff and would do it as a process of elimination.

What sensors have you cleaned, crank?

What's cold starting like, any hesistation?

Tried any injection cleaner?
 

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mg_zr
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Hard to hear the car running as someone appears to have Chieftan tank on tick over on the drive next to you!

Sounds awful!.

The running issue could be a number of things, coolant temp sensor, as already pointed out the temp gauge is looking iffy, so its not getting the correct signal from the ECU which suggests no input to the ECU from the sender.

You could also have a duff O2 sensor on the manifold at the PreCat, I would check the temp senders first as almost any issue will always then give an "o" sensor out of range message"

Hook up to diagostics is quick easy way.

The hydraulic lifters sound knackered too. Try some Wynns Lifter treatment and see if that clears them failing that pop cams out and strip/clean/replace the damaged ones, sounds like some have seized.
 

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after reading Matts reply, I listening to the video again, I turned the volume up and agree with what he says, time for a hearing test I think.
 

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Discussion Starter · #9 ·
start the engine, operate the throttle under the bonnet, spray butane around the inlet manifold and vacuum hoses and quickly take the revs up. if the flat spot isn't there, you have a leak.

It most probably isn't this........................ but I have the stuff and would do it as a process of elimination.

What sensors have you cleaned, crank?

What's cold starting like, any hesistation?

Tried any injection cleaner?
Can butane be bought from places like Halfords?

I have replaced the inlet manifold gasket so doubt its leaking there.

Ive cleaned crank sensor and various connections to sensors like TPS etc. but not actually taken them out and cleaned the end like I did with the crank sensor.
 

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Discussion Starter · #10 ·
Hard to hear the car running as someone appears to have Chieftan tank on tick over on the drive next to you!

Sounds awful!.

The running issue could be a number of things, coolant temp sensor, as already pointed out the temp gauge is looking iffy, so its not getting the correct signal from the ECU which suggests no input to the ECU from the sender.

You could also have a duff O2 sensor on the manifold at the PreCat, I would check the temp senders first as almost any issue will always then give an "o" sensor out of range message"

Hook up to diagostics is quick easy way.

The hydraulic lifters sound knackered too. Try some Wynns Lifter treatment and see if that clears them failing that pop cams out and strip/clean/replace the damaged ones, sounds like some have seized.
haha :lol: it does sound quite rough in that video but its not really like that. I think its down to poor quality/crap microphone on the camera (its a digital one not a proper video one) and also the sound rebounding off of the house. This running problem aside, its actually quite for a high mileage k series.

About the temp gauge......isnt it normal for it to take a while before it starts creeping up? It does start moving - cant recall how long it takes, but I havnt noticed much/any differance to my other Rovers. Sits just below half way once hot.

If it was the o2 sensor causing this, would it pass the emissions test on the MOT? As it passed about a month ago with this problem.

And the hydraullic lifters are fine, they are quieter at over 130k than my 416 is at 55k :lol:
 

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My 1.4 sounds just as bad when it's cold, i think the lifters just take a bit of time to start opening up and letting the fluids flow as they should.
 

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Discussion Starter · #13 ·
My 1.4 sounds just as bad when it's cold, i think the lifters just take a bit of time to start opening up and letting the fluids flow as they should.
Thats not the problem :lol: the problem is the hunting/dead spot. And it actually sounds quite nice for a k series, the video just makes it sound ****.
 

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Discussion Starter · #14 ·
Found that one of the small bolts securing one of the coil packs (cam belt end one) is loose - thread is stripped, would this cause problems when cold? Or would the other bolt be enough to secure it down without problems?
 

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cityrover
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Found that one of the small bolts securing one of the coil packs (cam belt end one) is loose - thread is stripped, would this cause problems when cold? Or would the other bolt be enough to secure it down without problems?
Hi Rover_King. Did you sort this issue I have exactly the same on a 1.6K in a Caterham. Starts Okish runs great for 30-60 secs then gets rough, reve die hunts and can stall. Once past the warm up period its fine.

Any help would be appreciated.
 

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Hi I don’t have the car anymore, but I’m pretty sure it’s actually sticking inlet/exhaust valves. It wasn’t sensors, coil packs etc etc. I was going to soak all the valve stems with a specialist cleaning solution rather than take it apart. I can’t remember who/where I found this out but the effect was exactly the same as my issue. I hope this helps.
 
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