all,

I just bought an 85 740 question, is my car a late model 84... how many different engines were in the 85???

 

according to VADIS, a MY 1985 US market 740 came with the B230F, B230FT, and D24T, and either the M46 manual or ZF22 automatic (turbos came with the AW71 automatic).

VADIS thinks there were no MY 1984 740's in the US market

whats the VIN number of this car? (you can XXXX out the last 4-5 digits if you want to keep it private).

 

This covers the 740 generally and explains the engine variants.

Volvo 700 Series - Wikipedia, the free encyclopedia

 

both the B23F and B230F are 2.3L 4 cyl gas motors. that article makes no distinctions. and it just refers to '4 speed automatic' without saying which versions had which specific 4 speed automatic in what years.

 

Yes, thats true. pierce
i knew it wasnt year specific but at least gave an overview of the 740.

When he gives you his VIN number that will pin down his specific engine model and transmission precisely.

 

the VIN doesn't actually distinguish between the B23F and B230F, they are both type 88, only the model year distinguishes them, B23F (1983-1984), B230F (1985-95)

 

So i found out I bought a 245! Thanks for all the input..

on a bad note, i have a terrible misfire. car has been sitting for almost 9 years..

Things I have replaced
Plugs OEM
Wires OEM
Fuel Pumps and pickup unit and filters
Full clean of tank
Cap/Rotor.

Things I have not checked.
Timing Belt
Timing
Fuel Pressure.
Compression
Will be checking theses things tommrow

 

First thing I do in an engine with 'terrible misfire" is take a compression test. If the compression is ok, then I do the tune up stuff.

 

oh, a 240. hah. different car, same engine, trannies, differential. differences are mainly electrical and cosmetic.

again, tho, a model year 1985 car should have a B230F, not a B23F. these are more similar than they are different, the B230F was the newer 'low friction' version, also had updated fuel injection.

re misfire, check for flakey wiring in the engine compartment. check for intake air, vacuum, and exhaust leaks.

I hope you're doing the brakes before taking this car on the road, any car thats sat for 9 years is for sure going to need its brake fluid changed and flushed, and very may well need master and wheel cylinder service. I'd probably slap new Brembo rotors and PBR semi-ceramic pads on it all the way around too, just on principle.

 

Update:

Compression on all Cylinders, are at 150 with in 1 to 2 pounds hot.

Found that on Cylinder 2 that the Injector is wet looks like it needs to be replaced.. Going to pull all injectors and clean..

Pulled all plugs and they are sooty black due to the misfire..

 

I believe I'd clip a timing light to one of the spark plug wires, and verify that its not missing with the engine... if it is, then time to trace the ignition system

also, check the timing belt, that the cam, intermediate shaft, and crank shaft are all in 'phase' with each other

 

Update:
Timing with timing light timing was ok, when i looked to see if the crank and cam lined up the Timing belt off 2 teeth, also found after speaking with another volvo guy that sometimes the vacum advance goes out, mine is electronic,
Set timing on belt and distributor:
looked at timing with vacuum on and off, when vacuum is off, most of the miss goes away and i gain power and i can hold and higher rpm and i get more throttle..,when i plug the vacuum back on the timing marks does not advance and engine starts to lobe and can not hold a stedy idle,....... Any

Replaced Fuel pressure regulator and replaced the engine tempature sensor



Car Still has missfire and blowing black/brown smoke!! r

 

what exact year/model car do you have? the VIN number would really be helpful as that identifies the engine, true model year, etc. you can X out the last 5 digits if you like, thats not important.

1985-ish 240's used a chrysler ignition module that DOES have vacuum advance, but its at the ICU, not at the distributor, eg, its done electronically.

 

Peirce,

I have an 85 245 Wagon, it also has that nasty ICU that has the vacuum advance, that is what stumped me because ALLDATA does not reflect my model


VIN
YV1AX8854F16XXXXX

 

ok, so its a B230F engine, and probably has Bosch LH-II injection, and Chrysler ignition.

the electrical connector to that ICU is very fragile, don't rock it if you unplug it, pull it straight out (easier said then done). they had a lot of trouble with corrosion on that connector, you may want to carefully tighten the sleeves in the plug, and fill it full of silicone electrical grease before re-installing.

ICU pinout:

1. green wire to coil pin 1
2. blue wire to power via coil pin 15
3. green wire to +hall sensor in distributor
4. n/c
5. yellow wire to 0 pin on hall sensor
6. brown wire to knock sensor on engine block
7. orange wire to full throttle switch on throttle body
8. green wire to ECU pin 1
9. black wire to - pin of hall sensor
10. black wire to chassis ground

 

Do my symptoms reflect a bad ICU? if so how can i test to see if it is bad ??

 

I would not assume your ICU is bad without a lot more testing and analysis. right now, the problem could be almost anything.

the only way I can think of to test one of those woudl be to swap it for another one in a known good car, and see if the problem moves with the ICU or stays with the car.

those connectors and wiring harnesses are funky enough that just doing that could cause damage.

1983-1987 were the years of 'biodegradable wiring harnesses'. the injection harness is more likely to be problematic.


wait, black+brown smoke? hmmm. have you done a compression test? pulled the spark plugs and checked their color ?

 

I have, all cylinders are at 150 minus or plus a few PSI. The plugs are black!, like it is running super rich,

 

Hello all, I do not know if I should develop a new thread in this unusual case .. I knew in my in the garage, under the car a tube in black color (the pictures) I'm sure that it fell of my volvo s 70. Can anyone help me locate it in my car?
I not know where it was? I think it has to do with running a vacuum system?

 

this section of the forum is for volvo 240/740/940... the S/V70 cars belong elsewhere.

that said, its hard to say what that tube is from, but it /could/ be part of the gastank vent to carbon canister system, it might be a chassis drain tube, or it might be a windshield washer hose, or maybe even an engine vacuum line.