i just bought a 72 lemans tempest, it drives ok but it sounds like the motor is too loud to be going as fast as i am like if im going 50 it sounds like im going 80 or faster, does anyone know why?

10

Asked by Feb 18, 2012 at 09:57 PM about the 1972 Pontiac Le Mans

Question type: Maintenance & Repair

i just bought a 72 lemans tempest, it drives ok but it sounds like the motor is too loud to be going as fast as i am like if im going 50 it sounds like im going 80 or faster, does anyone know why? another thing, if im at a red light and try to burn out it, it will burn out as if im about to haul ass all the way down the road but it starts slowing down and acting as if it cant handle me pushing down on the gas like i am, why doesnt it keep going fast all the way through? it also seems like my accelerator is too close to the floor. what is the cheapest way i can make my car run better can anyone help me?

15 Answers

55

Sounds like it needs a tune up. The carb orator needs to be adjusted and the distributor needs to be cleaned and the timing needs to be checked. Is it overheating too?

1 out of 1 people think this is helpful.
2,705

some one put 4.11's in the differential, gears like that will launch you like rocket but you will getbto the max limits of the engine (rpm's) at s slower speed

2 out of 2 people think this is helpful.
2,705

i bought a grand prix that had 3,42 gears in rear, facyory was 2.41 so it was quite a difference, speedometer read 85 i was going 55

2 out of 2 people think this is helpful.
10

ill get a tune up this week sometime how much should it cost to get my timing checked and get my distributor cleaned? the car isnt over heating though but my speedometer is showing about 30 miles faster than i am actually going what can i do about it......... about the 4.11 differential, i dont know much about that what exactly does that mean and what can i do about it?

1 out of 1 people think this is helpful.
175

Check for an exhaust manifold/intake manifold leak. an exhaust manifold leak will make your car very noisey, it also will reduce back pressure on the engine which will affect the vacume of the engine. This will greatly influence performance at higher speeds. An intake manifold leak will also affect performance and also can create noise but, it will be more of a high pitched whine. First, on a cold engine. Make a spray of water and dishsoap. Start the car and work your way around the exhaust manifold. If you notice a set of larger bubbles than from just the spray alone, you have found the leak. Check all vacume lines as well. If it smooths out at any point, check the area for cracks , cracked fittings or,disconnected vacume lines which are not plugged.

55

You're better off learning how to fix it yourself. Not many mechanics do carborator tuning anymore so if you find one you'll probibally have to pay a lot. If you're lucky someone you know can teach you. There's not a lot you can screw up on older cars just get it taken care of as soon as possible because your gas mileage as bad as it is on a car like that gets even worse if it's not tuned up

55

As for the axel ratio, that will cost thousands to change because you have to replace the whole rear axel

2,705

its easy to find out jack up the rear and put a couple of jackstands under the rear axle so both tires are off the ground, with the trans in nuetral, and front tired\s chocked, put a chalk mark on the tire and turn the driveshaft counting rotations until the mark is back to home position. if you turn thr drive shafy like 3 and half rotations, you have a 3.42 rearm etc........and by all means make sure engine is in good tune with no vacuum leaks, have fun with that cruiser !!!!!

175

If yours is an automatic another thing to check is make sure your torque converter/ trasmission fluid is not burnt or low. If the car has been driven hard before it is possible that the torque converter is bad.

5

I would check axle ratio my 68 firebird caim from the factory with 4.10 12 bolt , I had a 72 luxury lemans with 3.73 they really scream going down the road.

3,055

if you want the speedometer to work properly all you have to is change the speedometer gear in the tranny where the cable goes, and you don't have to change the whole rear axle to change to gear ratio. 1st thing is find out what exactly you have as far as the tranny,if it's automatic 350 or 400 or manual , & what rear end you have & go from there.

3 out of 3 people think this is helpful.
105

The old car gears (about three for an automatic transmission) make the RPM gauge rev high at 3k or more. To a modern six cylinder (V6) with an average of five gears these days, the RPM gauge might be around the same 3k at 80MPH. With a 400 engine, the RPM might have to work a little harder to keep the speed at least highway limit. It is a natural thing that can't quite disappear on old automatics, as an explanation.

What? ^

3 out of 3 people think this is helpful.
3,055

you have to be a lil more specific on the engine noise . is it that you have an exhaust leak ? or is the engine knocking or ticking,there are many things that came make noise.best thing you can do if you're gonna do the work yourself is to get a repair manual from pepboys or auto zone or if you have swap meets in your area you can pick up a Motor repair manual for about $10.00 just check & make sure it covers the years & repairs you need,they are not all the same. Good Luck, nice car !

1 out of 1 people think this is helpful.

Or like my luxury lemans 72 i got lucky to have a powerglide(2 gears tranny), a 12 bolt diff. And 14 inch rims!! Imagine the noise driving that in the highway.

Your Answer

Add photo

Related Questions

Le Mans

Looking for a Used Le Mans in your area?

CarGurus has 18 nationwide Le Mans listings and the tools to find you a great deal.

ZIP:

Search Pontiac Le Mans Questions

Pontiac Le Mans Experts

#1 Rucko
Rucko
Reputation 440
#2 Js08016
Js08016
Reputation 170
#3 Daniel Perron
Daniel Perron
Reputation 160
View All

Related Models For Sale

Used Pontiac Firebird
11 Great Deals out of 817 listings starting at $3,800
Used Pontiac GTO
9 Great Deals out of 492 listings starting at $5,900
Used Ford Mustang
678 Great Deals out of 38,414 listings starting at $1,963
Used Chevrolet Camaro
658 Great Deals out of 39,376 listings starting at $2,995
Used Chevrolet Monte Carlo
16 Great Deals out of 1,728 listings starting at $1,695
Used Dodge Challenger
414 Great Deals out of 25,354 listings starting at $7,980
Used Dodge Charger
529 Great Deals out of 28,971 listings starting at $2,275
Used Chevrolet Nova
197 listings
Used Pontiac Grand Prix
26 Great Deals out of 3,749 listings starting at $1,195
Used Chevrolet Corvette
352 Great Deals out of 20,285 listings starting at $3,688
Used Chevrolet Impala
927 Great Deals out of 36,332 listings starting at $1,800
Used Ford Torino
41 listings
Used Dodge Dart
351 Great Deals out of 16,453 listings starting at $4,751