Volvo 740 & 760 Forum -

New engine with 20K on it so far with new CAT.
Failed emissions with high NOX
What to do?
Thanks!

The tale of my sons 740 carries on, the fault is when travelling at any speed over 30 mph the engine misses a beat the rev counter goes back to zero for asplit second then everything is fine & dandy until the next time. All the electrics on the ignition side have been renewed except the coil the car runs very well apart from this fault.

HELP. J.Don.

i have a 1985 740gle, non-turbo. I tried starting it sunday and it died.I now have no power.When i turn the ignition nothing happens, i have no lights,no dash lights,no sound ,nothing!

converting from conventional to synthetic oil. Is it really necassary to flush the engine oil with some special cocktail to remove deposits and sludge or would a few filter changes every first couple of thousand miles take care of it?

Are the engines different in the volvo 740 models at all or are they the same. I know that the lights changed from 89 to 90 and are different but I wanted to take some parts off a parts car and wanted to know if the parts would be the same. I.E. the solenoids and relays on the engines are they same for all the years or are they different.

This may be a little long but info may be valuable to the diagnose.
Basically after running for a few hours on the highway I will get a random miss.
It may do it every 5 or 10 sec and it may go on for 2, 5, 10 minutes then go away.
I've had it come and go two or three times during a 19 hour trip from Pennsylvania to Florida. It usually takes two or more hours of running for the...

My son is having trouble with his 740 & he is thinking in terms of a new distributer cap but it is fitted right up against the bulk head any one have any ideas how to get at it without to much trouble I have never seen a cap fitted in such a fashion unless the engine was mounted crossways.

Hey one and all,
I just recently replaced spark plugs and cables on my 740 GL and now it idles very heavy as if one of the spark plugs isn't firing. I once encountered this symptom when and plug wire came off. I checked all of them to be sure and all seem on. What is causing this? Can anyone help. I'm a novice to the do it yourself thing and I'm stumped. Any input would be much...

hi i have a 760 gle 2.8 v6 when the gearbox is cold it will not change up to 4th gear until i have driven about 15 miles and the gearbox is warmed up then it changes up and down the gears ok could anyone please help

Hi just got my 740 2.3 GL estate as i was told they are realy great towing cars. Anyway as we are keen caravaners and our ( ford scorpio 2l default/blush.gif' 'blush.gif' /> )Has not realy got the grunt to pull 1300kg of caravan.the ford scorpio is a 1996 model.But the 740 is a 1990 model and...

I have a 1987 740 and the crank sunroof wont open it feels like the gear is rusted but im not sure any ideas on how to fix it

Hello all,
I'm an aspiring do it your selfer and was wondering if I could get some guidance. What tools are required? What spark plugs? What wires? Etc. My car is a 1990 740 gl in much need of a tune up. I've read various horror stories about overtorqued spark plugs and such and I don't want to use the wrong stuff. Do I really need a torque wrench?

Thanks...

okay i have a parts guy who can get me a good discount on my volvo parts. what turbo do i have? garret or mitsu? it is liquid cooled.

Speedo sometimes fails to register, then responds to sharp tap on dashboard. Must be poor connection, has anyone a clue where please default/' '' />

I just bought a 740, my first volvo. I've lots of good things about the brand and am looking forward to many problem free miles. I was wondering if anyone has any tips for keeping my 740 runnin another 100000 miles?

Hello "colleagues". I am driving Volvo 760 turbodiesel for a few years,a I have notice that it spent too much synthetic oil and it is not so "strong" with it.Visually,it doesn`t fit for the old engines,so my question is following...is there any one of you who really now what is the original or the best type of oil for the "old" turbo diesel engines.
regards to...

Hi
Dont know where to start looking. Idle running at 2000rpm all the time. After a run at higher revs on retard they drop to 1000 for a short time. Thankful it is an auto box or I would be fender bending!
Please help

howdy from the Keys,Would someone know the tank capacity on a 89 760 TurboWagon? Also I'm getting a fuel smell and it looks wet around the Sender nut.The fuel level from 1/2 tank seems to drop too quick.I'll get a new nut and seal before I pull up the Inspection cover! Thanks! JD

how often should i clean out my big air to air assembly? i think it is original any special instructions? i do this at work all the time on diesel truck air charchers.

default/dry.gif' 'dry.gif' /> i have a chance of some 5 spoke alloys /6.5j 16ins.part no 9157416volvo.anybody know if they will fit,86 740 estate ta dan default/blink.gif' 'blink.gif' />

I have a light that is intermittently coming on and off during driving and at crank up. My wife said she thinks its a lightbulb with a slash through it. Anyone have any ideas what it is and what it means?
Jdurham

the dashboard warning lights (ignition, parking brake, oil and screenwash) all stay on when the engine is running in my 1987 volvo 740gle. Belts, oil and coolant levels and screenwasher levels are all ok. could it be a bad eart or connection fault

ok so i am thinking of getting a performance cone style air filter. i looked on summit but couldn't find one for my application, any ideas?

ok my volvo has no driving lights but still has a switch in the dash for them. are the wires or harness at the light locatin pre wired to accept lights or do i have to run new wires and stuff?

joined volvo forms .com .Thought I could kick back and get all my volvo imfo. Well thats not working , lets just blame it on on the left side of my brain.
Heres the deal, looking for direction from all you volvo lovers , except for the ones in singapore, seems they have some bad chi going on. I have a 91 740 turbo wagon, of coarse I love it, which could be a bad thing. Never get...

whenever i get on the gas (past 3000RPM) i get that good old carbon smell like winding up your grandmas old 350 chev. any ideas on what that might be...i know usually it happens the first time then goes away but i can get my engine to do this several times a week and i don't drive like a grandma!....thanks again for your help...dan

so does the turbo on my volvo need exhaust backpressure to work right, how much can i free up my exhaust? also if i pull my injectors to put in new seals is there any way i can clean them?

i think i will justwrite a small essay of questions for you...ha,ha, so what is the black knob under/connected to my throttle body for?...also how does one set air/fuel? do they sell a meter od some sort?

i see these injectors seals for sale on volvo websites do these fail frequently or just replace when pulling an inj?

while checking out my car i decided to check vacuum. i tested 17 inches of manifld vac at a couple of ports, but at the port for the vacuum line that goes to the "T" for pcv i am only getting 10 inches. i cleaned both connections out and replaced the line to no avail. can these intakes and throttle bodies get that dirty inside? also how much vacuum should i be getting. i was planning in...

There's this guy with a 1986 740 Turbo. I have a 93 Chevrolet Camaro Z28 with 300 hp and 340 ft/lbs of torque that does 0-60 in around 5.5 seconds. How much work would it take to make the Volvo run with/beat me?

I have a 1989 740 turbo wagon, and it has some trouble starting up in the morning (just like it's dad). Generally I have to crank it over for a while before it does start, and when it does, it will rev up and down (between the fast idle speed and 200 RPM) In my honda, this problem would be very similar to air bubbles in the coolant system. Many times when the engine speed drops, the car...

Please would someone tell me where I can find the fuel pump relay switch in my newly purchased 1990 740 GL. We have problems with it stalling, and have been advised to change the relay. That is the most likely cause of the problem. However, I have been searching for the relay the past two hours. All I have for help and guidance is a copy of the Chilton repair manual for Volvos, 90 through 98,...

default/haha.gif' 'haha.gif' /> default/mad.gif' 'mad.gif' /> heres the deal , i have a 1990 760 turbo wagon with a b230f motor and a jetronic system . when the car runs it runs great,...

okay so i went and removed my oil trap and cleaned it a bit didn't seem to have any restriction whatsoever, i could blow through it very easily, the small vacuum port in the 45degree angle plastic piece was plugged solid though, i cleaned that out. idle quality seemed to improve but seemed to change good bad periodically? (it runs to the intake) is there anything else needed to check in the...

Hello from Key West,Thanks for all responses on my 760turbo questions! Now my neighbor has a 88 740 turbo for sale.He's not a mech and it won't start.Available in Key West. $500 and probably negotiable. Contact me,jeff at <crzhors@hotmail.com> Thanks!

Ok so thank you for your response to my posts they have been very helpful. I just did some exhaust work. i live in a no smog law county and the cat was plugged so i took it off and gutted for now. lots more power trouble is i am sucking the turbo intake hose shut at about 4200rpm. i will be replacing the intake hose and also my flame trap. i was curious if i could also run a breather style oil...

i was looking under my engine last night at work and saw what appears to be a switch or sensor. rh side of block towards the rear. just below th head. it is in the block but does not have any wires or plugs going to it...any ideas?

I have an engine with a rattle. I have pulled the exhaust no help, new plugs, air filter, oil&filter change. I am a mechanic so my foreman and i checked it out. We ruled out rods, crank, valvtrain. i checked for oil in water/water in oil. head gasket ok. plugs all looked good. engine starts and runs fine...lot's of power. we came to the possible conclusion that it's piston slap. the...

hi all, i have an 89' 740 turbo wich i am fixing up. I am a full time mechani on cars and big diesel trucks. the question i have is can i run a 180 degree thermostat without any detrimental side affects in my volvo? I have done this to many vehicles in the past for the summertime to let them run cooler without any issues.

The radio in my '86 740 works fine, but won't keep it's presets. The original was replaced with a "new" one from a salvage yard, which had matching-color wires. Everything works OK, but presets don't stick. Here's the wrinkle: This car has some defect in the wiring that causes the battery to slowly drain, so the previous owner installed a beefy cut-off switch which...

Hello from Key West,My hood flew open 50 mph.Well the hood hinges now are tweaked,anyone suggest a good source of used volvo parts,preferably in florida but any suggestion will help.Thanks, Jeff

I have a 92 740 wagon with an automatic trans that the 4th gear disengagement light will not switch off allowing the car to shift into high gear. If I turn the car off and restart it it still comes on and will not shift into high. I unhooked the battery and still no change. I popped out the switch on the gear selector and looked but still can't figure out what's wrong. I keep pushing...

when accelarating or at high speed, the turbo indicator goes (high) on yellow area, thick black smoke (not oil) comes out of exaust. can this be:
1- turbo
2- converter
3- engine electric
4- or something else.
Turbo works ok at low speed, spark plugs and distributer cap are new.

I want to ask anyone who knows about 740 turbo, my sends out thick black smoke and loses power when turbo indicator goes up to yellow area. Generally when car is going up the hill or when accelarates.

I have a 1986 760 turbo and my sunroof wont go all the way up or all the way open it moves just not enough if anyone has ideas what it might be please let me know

just chasing ideas, opinions on an after market EMS for 740 turbo wagon. the 5500rpm doesnt allow the cars full potential. current mods are:
3" turbo back exhaust, Front mount intercooler, custom cold air intake, BOV, upgraded fuel system 15psi boost default/grin.gif' 'grin.gif' />...

Hi, anyone knows if the 740 87 model had diff lock as standard like the newer 940 have?
and what hp does the 740 turbo have original? is it chip-able?
thanks
robert