Cuts out at 3K - Land Rovers Only

Greg M · 05-23-2007, 10:02 PM

My engine keeps cutting out around 3000 rpm's.

This is not a "spot" on the throttle like a TPS bad spot. For example, whenever i climb a hill on the highway, if i drop it into a lower gear, and i hold the same throttle settings, its fine until about 3K, then it jerks and bucks like its not getting gas.

Ideas? Distributor missing a beat? Fuel pressure?

stevo-II · 05-24-2007, 12:53 PM

ignition coil - i had an old 64 tbird that behaved the exact same way, the coil couldn't handle higher RPM's - and it started all of a sudden

TerryS · 05-24-2007, 02:03 PM

You may have eliminated the TPS by reproducing the failure point in different gears, but it's so easy to check with an analog meter, do it anyway.
I'm not so sure about the coil but it does have an ignition sound to it. I would be looking at the pickup coil, amplifier, and coil as a system, and rule out each of the three components individually. Best way to do it is with a scope, looking at the firing of the amplifier, but if you don't have a good DC scope, it's hard to look at the pickup coil pulses, or the amplifier switching pattern. A meter, analog or digital is too slow to react the the pulse. Hate to say it, but R&R method may the simplest way.

Greg M · 05-24-2007, 02:51 PM

Thanks guys. The TPS does have a pretty good bounce on the meter, but its only when its full to the floor throttle. This happens at about 3/4 throttle and right around that 3000 mark.

The coil is a crane cams high output job that was on it when i bought it. I won't rule that out, but its less likely to be a culprit than the original. Pickup coil and amplifier are certainly possibilties. my amplifier is still in the original location.

Go idea Terry, I'll probably end up taking it in to someone that still has a scope and have them look at it.

In the meantime, I am getting her loaded up for fly fishing trip, so gotta go!!

TerryS · 05-24-2007, 05:11 PM

Quote:

Originally Posted by Greg M

In the meantime, I am getting her loaded up for fly fishing trip, so gotta go!!

Bite Me!

LANDY96 · 05-27-2007, 08:05 PM

When I bought my 93, the PO told me he had the exact same problems. He replaced plugs, wires.....then distributor/cap/rotor...... then coil....finaly found out it was the alternator.....

He said that when tested it was fin, but under a load, it just wouldn't work right. Replaced, and still is working fine!

Greg M · 05-29-2007, 05:04 PM

Quote:

Originally Posted by TerryS

Bite Me!

Oh yeah? Well now i have to rub your nose in it. We went up to the famed Silver Creek just outside Picabo. The last one is a shot of the Nature Conservancy's preserve. We didn't fish there. Too many folks on Memorial weekend.

TerryS · 06-28-2007, 04:41 AM

Nice pictures Greg, but, uh...... Where are all the fish?

Greg M · 06-28-2007, 09:36 AM

In the flipping creek!! I caught a few 8" inchers but nothing to write home about. Silver Creek is pretty famous fly water, so it gets quite a bit of pressure. Spooky fish, long leaders, and tiny flies make for some challenging fishing for sure. I like to consider myself a fairly good fly fisher, but I couldn't get a big boy to rise to save my life.

05-23-2007, 10:02 PM	#1 (permalink)
Greg M Senior Member Join Date: Jan 2006 Location: Boise ID Posts: 219 Gallery: 0	Cuts out at 3K My engine keeps cutting out around 3000 rpm's. This is not a "spot" on the throttle like a TPS bad spot. For example, whenever i climb a hill on the highway, if i drop it into a lower gear, and i hold the same throttle settings, its fine until about 3K, then it jerks and bucks like its not getting gas. Ideas? Distributor missing a beat? Fuel pressure? __________________ Greg M 1987 RRC Rovers haven't made it to the far reaches of the Earth worrying about warning lights.

05-24-2007, 12:53 PM	#2 (permalink)
stevo-II WWTSD? (what would Tony Soprano do?) Join Date: Jun 2006 Posts: 116 Gallery: 0	ignition coil - i had an old 64 tbird that behaved the exact same way, the coil couldn't handle higher RPM's - and it started all of a sudden __________________ 2001 D2 -The Stevo-II 1992 RRC-The Stevo-I

05-24-2007, 02:51 PM	#4 (permalink)
Greg M Senior Member Join Date: Jan 2006 Location: Boise ID Posts: 219 Gallery: 0	Thanks guys. The TPS does have a pretty good bounce on the meter, but its only when its full to the floor throttle. This happens at about 3/4 throttle and right around that 3000 mark. The coil is a crane cams high output job that was on it when i bought it. I won't rule that out, but its less likely to be a culprit than the original. Pickup coil and amplifier are certainly possibilties. my amplifier is still in the original location. Go idea Terry, I'll probably end up taking it in to someone that still has a scope and have them look at it. In the meantime, I am getting her loaded up for fly fishing trip, so gotta go!! __________________ Greg M 1987 RRC Rovers haven't made it to the far reaches of the Earth worrying about warning lights.

05-27-2007, 08:05 PM	#6 (permalink)
LANDY96 Senior Member Join Date: Jan 2005 Location: Beaumont, Texas Posts: 782 Gallery: 0	When I bought my 93, the PO told me he had the exact same problems. He replaced plugs, wires.....then distributor/cap/rotor...... then coil....finaly found out it was the alternator..... He said that when tested it was fin, but under a load, it just wouldn't work right. Replaced, and still is working fine! __________________ Eric The Red 93 Range Rover Classic We will never "arrive" so the goal is to keep moving forward on our journey so we can periodically declare, "I am not what I want to be, but I am not what I used to be!" 96 DISCO SE7 5-SPEED SOLD ....okay couldn't live without a disco! 96 DISCO SD 5-SPEED -ARB Bumper -OME 2" Lift -2" spacers -Safari snorkel -15" steelies

06-28-2007, 09:36 AM	#9 (permalink)
Greg M Senior Member Join Date: Jan 2006 Location: Boise ID Posts: 219 Gallery: 0	In the flipping creek!! I caught a few 8" inchers but nothing to write home about. Silver Creek is pretty famous fly water, so it gets quite a bit of pressure. Spooky fish, long leaders, and tiny flies make for some challenging fishing for sure. I like to consider myself a fairly good fly fisher, but I couldn't get a big boy to rise to save my life. __________________ Greg M 1987 RRC Rovers haven't made it to the far reaches of the Earth worrying about warning lights.

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05-24-2007, 02:03 PM	#3 (permalink)
TerryS Moderator Join Date: Aug 2004 Location: Bloomfield, CT If I died today, I lived there all my life. Posts: 2,229 Gallery: 0	You may have eliminated the TPS by reproducing the failure point in different gears, but it's so easy to check with an analog meter, do it anyway. I'm not so sure about the coil but it does have an ignition sound to it. I would be looking at the pickup coil, amplifier, and coil as a system, and rule out each of the three components individually. Best way to do it is with a scope, looking at the firing of the amplifier, but if you don't have a good DC scope, it's hard to look at the pickup coil pulses, or the amplifier switching pattern. A meter, analog or digital is too slow to react the the pulse. Hate to say it, but R&R method may the simplest way.

06-28-2007, 04:41 AM	#8 (permalink)
TerryS Moderator Join Date: Aug 2004 Location: Bloomfield, CT If I died today, I lived there all my life. Posts: 2,229 Gallery: 0	Nice pictures Greg, but, uh...... Where are all the fish?

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