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still can't get RPM over 1500...please help.

1860 Views 11 Replies 7 Participants Last post by  johnno
So, I have an 88 Range Rover, 3.5.

It starts after a few cranks, idles (a little bumpy), and when I depress the accelerator, it spools up to 1200-1500 and then bogs out. To bring it back to idle, I need to feather the throttle until it is back.

I have done the following:
coolant sensor
idle air by-pass motor
fuel filter
fuel pump

With all of that, the exact same thing occurs. I have researched the same symptoms, and everybody seems to fix it with the fuel pump...that was my last effort.

Can somebody please guide me. What should I do from here.

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Re: I now can get RPM's with no O2...

knie0012 said:

So I took both O2 sensors out...and now the truck will start, idle and accelerate like normal...

Are the O2 sensors junk? Catalytic converters junk? Or what is my next step of action?

"Cleaning" an O2 sensor may only solve part of the problem, but the sensors themselves become less sensitive with time, and the mixture richens as a result over time. This aging of the O2 sensors results in fuel economy going from not-so-good to just plain miserable on a Range Rover, and with the EFI light on the catalysts will clog with soot. This is why all manufacturers require replacing O2 sensors between 40,000-60,000 miles. I replaced mine with the same size O2 sensors from a Nissan V-6 pickup for a lot less than the OEM replacements, and it made quite a difference. I got them for about $55 each on-line.

New, high-flow catalytic converters are available that are much smaller than the OEM units. A few years back we had to replace the single cat under our full-size Olds wagon so it would pass the smog test. The local muffler shop came in with the low bid using a generic cat rated for 300 hp V-8 engines (overkill for the wimpy Olds Rocket V-8 in the Custom Cruiser). It weighed all of 15 lbs. and was less than a foot long with huge inlet and outlet pipes. The car passed smog easily afterward, and continued to run fine. The whole job was $200. Two of those little cats would be overkill for a Range Rover, but they would work very nicely. (Yeah, they're not original, and you'll lose points in a concours, but most folks on this forum are more concerned with performance, so keep them in mind.)

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