88 RRC idle problems
Discussion
Hi everybody,
What I have is a 88RRC that has the following symptoms and would really appreciate any advice or direction as to what might be wrong.
Car starts almost always first time. The revs in park or neutral are about 700. When I move into gear or reverse the revs drop about 200 to about 530 rpm. I set off and drive around and there is plenty of power and acceleration (for a 88 3.5L of course). It kicks down pushing her up a hill to give that little oof. Accelerating around town, it will get up to about 4000 rpm. So seems like normal driving is ok (of course could be wrong)
The problem is that as I brake and the car comes to a stop the revs of course return to idle. As the engine heats up the idle revs after coming to a stop get lower and lower. I went for a spin on the weekend and the bloody thing started to cut out after coming to a stop.
What I ended up doing was shifting to neutral at the last moment of braking as this kept the engine ticking over and the revs up. I had to touch the accelerator and shift to gear to kick off again. Any ideas.
Just some background on the car. Top end rebuild about 3500 miles ago. magnecor leads, NGK plugs, new coil, new rotor, new stepper IAC, all fluids changed regularly and recently, oil level fine, coolant and new coolant temp sensor, new K&N air filter plus, new fuel filter, checked fuel pump and pressure was good also and some other stuff I probably forgot.
I tried with a spare ECU and the same thing happened. TPS set correctly and seems smooth (Multimeter used for test).
Any thoughts on what I should do next.
Here are my thoughts on what is left
1 - vacuum leak (pumping break pedal makes idle revs wobble), all break componets tested and check ok
2 - ignition amplifier module (I get the heat as the sympton has been reported before, but why do the revs drop so when cold)
3 - bad MAF
4 - o2 sensors (again cold idle?)
5 - injectors, compression etc.
6 - lucas' revenge
7 - old rover being a cantankerous old bugger
I also notice that sometimes I get a burning smell from the exhaust after a spin. It seems like a dry burning smell could be unrelated.
Maybe none of those I list above are related to the problem, but I am at a loss and would really appreciate some definite direction as to how to objectively go from here rather than just start swapping parts as this old beast is expensive enough already.
Cheers
Freddy
What I have is a 88RRC that has the following symptoms and would really appreciate any advice or direction as to what might be wrong.
Car starts almost always first time. The revs in park or neutral are about 700. When I move into gear or reverse the revs drop about 200 to about 530 rpm. I set off and drive around and there is plenty of power and acceleration (for a 88 3.5L of course). It kicks down pushing her up a hill to give that little oof. Accelerating around town, it will get up to about 4000 rpm. So seems like normal driving is ok (of course could be wrong)
The problem is that as I brake and the car comes to a stop the revs of course return to idle. As the engine heats up the idle revs after coming to a stop get lower and lower. I went for a spin on the weekend and the bloody thing started to cut out after coming to a stop.
What I ended up doing was shifting to neutral at the last moment of braking as this kept the engine ticking over and the revs up. I had to touch the accelerator and shift to gear to kick off again. Any ideas.
Just some background on the car. Top end rebuild about 3500 miles ago. magnecor leads, NGK plugs, new coil, new rotor, new stepper IAC, all fluids changed regularly and recently, oil level fine, coolant and new coolant temp sensor, new K&N air filter plus, new fuel filter, checked fuel pump and pressure was good also and some other stuff I probably forgot.
I tried with a spare ECU and the same thing happened. TPS set correctly and seems smooth (Multimeter used for test).
Any thoughts on what I should do next.
Here are my thoughts on what is left
1 - vacuum leak (pumping break pedal makes idle revs wobble), all break componets tested and check ok
2 - ignition amplifier module (I get the heat as the sympton has been reported before, but why do the revs drop so when cold)
3 - bad MAF
4 - o2 sensors (again cold idle?)
5 - injectors, compression etc.
6 - lucas' revenge
7 - old rover being a cantankerous old bugger
I also notice that sometimes I get a burning smell from the exhaust after a spin. It seems like a dry burning smell could be unrelated.
Maybe none of those I list above are related to the problem, but I am at a loss and would really appreciate some definite direction as to how to objectively go from here rather than just start swapping parts as this old beast is expensive enough already.
Cheers
Freddy
Have a look on the LR Owners forum
http://threads.lro.com/cgi-bin/wwwthreads/postlist.p
Do a quick search on "Idle" this will bring up a whole heap of answers.
One thing to consider is a gearbox oil change and a cleaning o the stepper motor on the back of the plenum (not sure if this is on an 88 model. I have a 91 3.9 EFI which is a bit different
http://threads.lro.com/cgi-bin/wwwthreads/postlist.p
Do a quick search on "Idle" this will bring up a whole heap of answers.
One thing to consider is a gearbox oil change and a cleaning o the stepper motor on the back of the plenum (not sure if this is on an 88 model. I have a 91 3.9 EFI which is a bit different
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