Pokey Feeling

kjg48359

Well-known member
Oct 19, 2004
200
0
62
Detoit MI
Ok, after a couple of years of the vehicle sitting, I've finally gotten all grounding straps connected, new plugs, new condenser, new wires, new filters (air, and fuel). It finally seems to run without any fault codes either (and that's a big step for me). It's a '90 classic, with the stock 3.9.

But the engine still feels a little sluggish, especially at the lower speeds. I even cleaned out the throttle body to get the 'gunk' out of the way.

One thing that I did do (is this right?) was to place a small washer between the IACV and the manifold to replace the worn out washer that was there.

I can't really think of anything else, but when pressing on the accelerator, there doesn't really seem to be much power (the acceleration seems a little sluggish). I can feel an increase in power when I get the engine speed up to about 3,700-3,800 rpm. It's almost feels as if a separate air intake/runner is opening up (is that what it is?).

Is it maybe just that I'm expecting too much? I realize it's a heavy vehicle, by it's no where near as peppy as other v8 Rovers I've felt myself in before (not that I'm an expert, after driving for 30+ years, this is really the first v8 I've ever owned. Although I can remember how slow my father-in-law's S-class was off the line in the Mid 90's even with a 5 litre and that was a massive beast of a vehicle, that is until you got the vehicle moving to about 15 mph).

Anything else I might have overlooked that might need replacing/tweaking/filtering/cleaning?
 

kjg48359

Well-known member
Oct 19, 2004
200
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62
Detoit MI
thanks, but the fuel filter was one of the first things I did over a year ago. I'm not sure about the vacuum advance though. Timing should be all set, hopefully that was set up when the new distributor was put on about 2 years ago (I've only got about 20 hours on it since then, it mostly sits in the garage waiting for me to 'tinker' and dream build on it).

What do I need to be able to do to check/adjust the vacuum advance? (I do have a RAVE CD, but I"m very much a do-it-yourselfer-in-training.) Thanks.
 

logigeek

Well-known member
Oct 4, 2004
680
0
Just curious, but what if you do have a bad tank of gas... do you siphon it out or something?

I added non-premium gas to my other car once, and it pinged horribly if I stepped on the gas. I ended up just driving really slow until the tank ran out....
 

az_max

1
Apr 22, 2005
7,463
2
logigeek said:
Just curious, but what if you do have a bad tank of gas... do you siphon it out or something?

I added non-premium gas to my other car once, and it pinged horribly if I stepped on the gas. I ended up just driving really slow until the tank ran out....

If it's a full tank, drain and refill with fresh. If it's a partial tank, top-off with fresh of a higher octane. Continue to top up the tank over the next week or so to dilute the old stuff in there. Change fuel filter afterwards.


If it's just pinging badly, add octane boost and top off with premium during the week.
 

proletariat

Well-known member
Jun 10, 2005
51
0
To check vacuum advance, pull the hose off the manifold and draw a vacuum with your mouth. On mine, air pulled right through, indicating the diaphragm was perforated. I suppose the advance mechanism could also be frozen, in which case you could draw a vacuum, but the mechanism wouldn't move.

Replacing the advance and timing by ear made a world of difference in acceleration off the line. (I think that rovers are timed too retardedly from the factory to account for shitty gas found in 3rd world countries. Mine is timed well in advance of stock and runs well on 87 octane.)
 

kjg48359

Well-known member
Oct 19, 2004
200
0
62
Detoit MI
Check your Cats if they are restricting exhaust flow it could be your problem.Good Luck

There's an idea. Mine are probably the original (and there's like apx 117,000 on the odo). I seem to get plenty of exhaust at idle, what's the best way to check these?
 

Zebra

Well-known member
Jul 15, 2007
365
0
66
Louisa Va
Mine seem to be fine at idle as well but it was clogged. Hints were the following engine compartment seemed to be extremely hot and got there fast also after driving a bit the terrible odor. I also noticed engine seem to be loosing power no pep like it was bogging down when I excelerated. To check what I did was broke exhaust loose at the Y pipe and found what looked like a pile of charcoal brisket pieces lodged in the pipe. The cats were shot and passing their guts not allowing engine to breath after fixing it preformance afterwards was amazing.


Hey its a shot at your problem and wont take much time or funds to check.

George
 

kjg48359

Well-known member
Oct 19, 2004
200
0
62
Detoit MI
I guess it won't hurt to look at the Y pipe. After thinking about this, I will say that I can still feel an increase in power when the engine speed is above about 3,500 rpm. It's just not getting to that point really quickly.

I'm not sure if it's just that the weight of the vehicle is a factor I'm not used to. My Freelander felt peppier, but still nothing like the tin can I'm currently driving. But I will say, that when pressed, my wife's Trail Bloat (blazer) can get up and go quicker yet.

I'll kind of go over things again perhaps later in the soccer off-season. But I will say, I'm not smelling too much after the vehicle warms up.