Having problems with your 1986 Alfa Romeo Spider ?

Low Oil Pressure and rough idle

\015 I have a 1986 Spider Graduate, recently bought from online seller. I'm also new at restoring cars. So far, I've just cleaned and re-oiled the K&N air filter, and put new gas in the tank. The oil needs changed I'm sure, but the oil pressure guage indicates a pretty low pressure, and it idles very rough, threatening to die if I let off the gas. The oil dipstick seems to indicate the oil is full. What might cause the low oil pressure, if the gauge is correct, and I am reading the dipstick correctly?Also, the car has rust damage on the underside. What is the best way to fix this?Thanks\015 Posted / edited by AnonymousUser on : 15-01-2018

Answers :

Please understand, all I can offer you are suggestions, since I don't have access to hands on testing. You might first change oil and filter.
\015\012 If going by the oil pressure guage, low oil pressure can mean worn crankshaft bearings, as the clearance between bearings and crankshaft is what determines oil pressure.
\015\012 Of course a worn oil pump can cause the same problem.
\015\012 You might want to connect an external oil pressure guage to the engine to verify the pressure reading.
\015\012
\015\012The rough running at this point would be hard to pin poit.
\015\012Because I do not know the extent of the rust, I can suggest that you consider having it undercoated.
\015\012
\015\012Again, I can only make suggestion because you need an absoluate diagnosis.
\015\012jetski
Repair Help & Product Troubleshooting for 1986 Alfa Romeo Spider

Tips for a great answer:

- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.

Suggested Questions/Answers :

I just did an low end job on my 1993 ford f250 7.3 liter deisel pickup which means i replaced the rods, mains, and oil pump in the engine. i lined the gear timing marks up on the crank, cam, and fuel pump gears. and now when it starts it cranks fine but it smokes like its getting way too much fuel and it idles really rough. it was running fine before i did the job with my dad but it was loosing oil pressure. now that i done this to the engine it has great oil pressure but runs rough until you ge


Out of timing ... Ford F-250

Low Oil Pressure and rough idle


Please understand, all I can offer you are suggestions, since I don't have access to hands on testing. You might first change oil and filter.\015\012 If going by the oil pressure guage, low oil pressure can mean worn crankshaft bearings, as the ... 1986 Alfa Romeo Spider

2006 H2, 113K miles. DIC indicated Low Oil Pressure at idle. No engine noise, seems to run fine. Happens only at idle. Pressure gage rises correctly while accelerating, at steady speeds oil pressure steady no drops. At idle oil pressure drops normally and stays steady. Had sensor replaced, had manual oil pressure checked all ok, had oil pump replaced by dealer. Dealer says they cannot find the problem. Has any one had this issue?


Did you try changing the actual oil pressure gauge? ... 2006 Hummer H2

Pressure building in crankcase & blowing oil out the dipstick pipe and other weak seals. Appears that parts off the breather are missing although the diaphram seems to be complete. Idling and low revs = very rough. Travels well at 100kph except for blowing oil every where.


Change the PCV positive crank case ventilation valve. ... Mini Cooper Clubman

4.3 misfire in 6, low oil pressure, strong gas smwll, rough idle, skipping, cut backs and cut offs and rough jumping after 2000 rpm


... 1993 Chevrolet S-10 Blazer

My 94 jimmy idles very rough,has a strong sullfer smell coming from the exhaust,reduced power and the service engine soon light is on.also the temp gauge wil not rise above the "c" on the dial and at idle the oil pressure gauge drops way low but increases as rpm rises.


... 1994 GMC Jimmy

2003 Tahoe, 5.3 liter vortec flex fuel. Engine replaced at 60k miles due to low end knock (typical late model GM). Scanner shows mutiple misfires on all 8 cylinders and erratic timing. Rough idle. Everything replaced, knock sensors, ckp sensor, even the computer. Everything else tested, checks out fine, fuel pressure, oil pressure, compression all good, even the Chevy house can't figure it out. Any suggestions?


This is a comon problem on chevy 00-06 models a computer ground ,it seems ok at sight but inside it's just holding a few wires ,get under the car on the driver side passenger there you should find a two ground wire goin to the block a big, and a smal ... 2003 Chevrolet Tahoe

I have a 1992 El Dorado. It runs like a TOP! It has just over 182,000 miles. I took it for an oil change and now, at low idle, the "LOW OIL PRESSURE / STOP ENGINE" comes on. I took it back and the mechanic replaced the oil pressure sensor, a thermostat (different issue) and the oil filter housing as it had a slight crack. Now, the light STILL comes on and the mechanic told me "not to worry" as the pressure with a guage is at 30 lbs and the minimum acceptable is 11....suggestions??


I would check the wiring between the oil pressure sensor and the computer. The computer is reading low or no pressure, hence the warning light. If your mechanic is telling the truth about the pressure and the pressure sensor is good, that is the on ... 1992 Cadillac Eldorado

Oil pressure is fine until engine warms up. Oil pressure drops very low and the light begins to flicker at idle. Later at idle oil pressure drops to zero and comes up upon increasing the RPM's. Oil pump and screen have been replaced 3 times. Should I consider engine rebuild?


There are 2 things you should try first. First thing to do is get a compression test done. I suspect it will be low, thus indicating a lot of wear. The other thing to do is upgrade your oil to a heavier one, at least 15W40 or maybe 20W50. This should ... 1997 Dodge Ram 1500 Club Cab

The car runs fine when cold but after driving 10 or 15 miles it acts like its hot even though gauge says normal--hesitation on acceleration and rough idling we've also been having trouble with the radiator over pressurizing pushing coolant into reservoir. When the engine cools it doesn't pull the coolant back into the radiator.so the next time you start up the coolant level is low. IT has a new radiator,new water pump,new radiator cap new intake gasket and there's no water in the oil.


Sounds like air in the cooling system.What year camaro?What engine size?Have vehicle running at operating temp and slightly open cooling system bleeder (if equiped) leave open until you get coolant only and no more air.If this doesnt work have coolin ... Chevrolet Camaro

2003 5.4L ford expedition high temp low oil light came on and turned off but now the pressure gauge is at 0 and vehicle idles really rough. Any thoughts. Thx Nic


... Cars & Trucks

2000 silverado-low / no oil pressure atstartup for first few seconds, once engine is warm holds 40 psi @ idle, after driving for an hour or so, hold 60 psi while driving and 40 @ idle. My question, what would cause low to no oil pressure @ startup and is ther a fix for this problem.


Sounds like you have sludge build up in the engine. you should try a oil additive to help clean out some of that sludge on your next oil change ... Chevrolet Silverado 1500

1994 gmc with 350 engine idles rough and has low oil pressure. Also, it has no power and will barely pull itself up a hill.


Fit new air flow meter firstly that will cause lose of power.also chage the oil and filter. ... GMC Sierra 2500HD

2008 1500 suburban, pickedcar up after getting tires replaced, on way home oil pressure dropped and low oil pressure warning came on. Stopped checked oil level it was ok. started car was back at 35 to 40 PSI at idle a couple miles down the road pressure dropped again. Engine sounds normal no ticking or knocking, RPm om tach is stable 700 to 800 at idle. is this a sending unit problem or is there something with the pump.


If your sending unit is one wire, unhook it from the sender and place a jumper wire from wire to ground. Turn ign on, gauge should pep high PSI. Two wire plug, place jumper between contacts of wires (unplugged). Same thing. What this does is isola ... 2008 Chevrolet Suburban

While i'm idling at a dead stop, the oil pressure drops down really low and the Computer reads "oil pressure low" "stop engine".does this sound like a oil pressure switch? it's fine while driving. (2002 Bravada)


Have the oil pressure tested with an accurate mechanical gauge. often the sending unit goes bad, but without testing it could cost you an engine before you find the problem.If the mechanical gauge shows same low readings, you have internal engi ... 2002 Oldsmobile Bravada

2002 trail blazer runs good unil its stopped @ idle (600 rpm) the oil gauge pressure drops off fast and check gauges light comes on followed by low oil pressure read out . If i give a little throtle to 800 to 1000 rpm the pressure comes back to 45-50. I replaced the oil pressure sensor, no oil burning or leaks, but shuts donwn kind a hard when im done driving sometimes. I recently took a 1200 mile trip with this vehicle with no other problems than the oil pressure dropping to zero. The oil press


Thank you for being very clear, most of the people on this site write very little or very poorly.On that note, on to options. It's either (in my expert opinion) an internal engine problem, or your computer/spark plugs needs to be replaced ... 2002 Chevrolet TrailBlazer

My 1989 Ford Ranger 2.3L 2wd has a problem in the oil pressure area. The pressure gauge at idle says normal but when accelerating it goes past Low. I replaced the pressure sending unit and it didnt change the way the gauge works. The oil is brand new and the engine isnt making any noises like it has low pressure. What can I do?


I would take the sender out and install a temporary manual gauge (we use a manual SW gauge connected to a 3' length of 1/4" high pressure hose). If the oil pressure is normal on the manual gauge then about the only thing left is the gauge itself. ... Ford Ranger

1996 oldsmobile aurora oil pressure sensor says low oil pressure my mechanic checked it out and replaced the oil pressure sensor and problem still exsists he tested the oil pressure recommended 20 PSI when engine is hot and idling drops to 16-18. Already tried switching to synthetic oil did nothing. please help


The Aurora is a low pressure oil system. The only solution available at this time is to increase the oil weight. I went o straight 30W to solve the idle alarm issue. Some use 20W oil and that works too.With 20W you will be at 80 to 90psi cold ... Oldsmobile Aurora

Changed intake manifold gaskets, and while doing so, spilled a bit of coolant that was left in the intake in with the oil. Changed the oil before I even started my truck, and since then, I will have oil pressure when truck is cold, but the more the motor warms up, the more the oil pressure drops, eventually right to zero when fully warmed. (Idle/high speed doesn't matter) It turned the truck off when it got to zero once, and idles horribly when pressure is low. Will the sending unit shut truck o


The '93 does shut down on low oil pressure. If I were you, I wouldn't take any chances. Go ahead and replace the oil pump. You are going to have to drop the il pan anyway. No use in doing it twice. ... 1993 Chevrolet K1500

I have a 1992 Corsica, 3.1, v6, automatic, all of a sudden idles extremely rough, have to push gas peddle way further to make it move, has a funny smell, possibly small amount of water in oil, (only shows up right after engine has been running and on first dipstick only) doesnt seem to be shifting right, idle in gear is so low and rough car seems like its gonna die but doesnt, seems like low pitch popping sound from tail pipe when in park. i read your previous q & a's and possibly head gasket bl


... Cars & Trucks

The vehicle has very low oil pressure... less than 40 shortly after warm up and drops to near zero at idle. It also appears to lose power while driving almost like only a couple of the cylinders are firing and when I floor it it ''catches'' and accelerates... could the low oil pressure be the cause of this problem?


How many miles and what engine size?\015\012Did the oil pressure appear to be low at the same time the engine seemed to be misfiring? The reason I ask, is because there may be two problems occurring at once or there may be one prob ... 1998 Chevrolet S-10 Pickup

Low oil pressure at idle 1986 suzuki samuria . what should oil pressure be at idle speed


... 1986 Suzuki Samurai

2009 GSXR 1000, low oil pressure at idle after changing oil and filter.


... Cars & Trucks

Oil pressure gauge shows oil pressure is rising while rpm's are higher and lower oil pressure when low rpm's or at idle. Is there a problem?this is a 2002 sonoma pickup 4cyl motor 2wd


How low does it get? This is a normal situation. As long as it doesn't get lower than 10 psi at idle. ... 2002 GMC Sonoma Extended Cab

I have a 93 cabriolet, i was having the low oil pressure light coming on so i changed the oil and the light comes on again after driving the car for 20 minutes. when i rev the engine the light goes off and the oil pressure increases but when i idle the pressure reader reads below 1. What do i do???


Your oil pump is failing. If the light only comes on at idle, it is not an immediate problem, but if it gets worse it will need to be replaced. ... 1988 Volkswagen Cabriolet
  • Start your question with What, Why, How, When, etc. and end with a "?"
  • Be clear and specific
  • Use proper spelling and grammar
all rights reserved to the respective owners || www.carrestorationshop.com || Terms of Use || Contact || Privacy Policy
Load time: 1.9212 seconds