I need to find out correct order the wires go on the back of the ignition for 1990 volvo740

The car is not equipted with a cabin filter

well if your engine turns over but will not fire you may have a bad ignition coil so please locate it and check for voltage at small wires attached to the coil but DO NOT CHECK FOR VOLTAGE WHRE THE WIRE GOES FROM IT TO THE ENGINE.

You need to get an exact firing order diaghram for your make,model and engine,

call any autoparts store, and they will give you the firing order for your truck, if one

or more wires are wrong, can cause the engine to backfire or run bad. also make

sure you have the correct gap on your sparkplugs. check and set the timing,

if needed, the auto parts will also have the timing marks position. good luck!

You may need a ignition switch.Check the battery to make sure it is good,look to see that the wire for the solenoid ,the purple one is on the correct terminal,and that all the wires on the solenoid switch large post where put back on,check the fusible links on the large post connection are not burned into,if this was helpful,please rate,thank you.

For the 1990 Oldsmobile Cutlass Ciera.
Engines 2.5L and 3.3L included below:

For the 2.5L In-Line 4-Cylinder:
Firing Order:
1-3-4-2
Cylinders:
........(back)
1......2......3.......4
........(front)
Ignition Coil Connections:
(back)
...1
...4
...2
...3
(front)

For the 3.3L V6:
Firing Order:
1-6-5-4-3-2
Cylinders:
........(back)
2.........4.........6
1.........3.........5
........(front)
Ignition Coil Connections:
(back)
__
o <--1
o <--4
__
o <--5
o <--2
__
o <--3
o <--6

For the 1990 Buick LeSabre 3.8L V6:

Firing Order:
1-6-5-4-3-2

Cylinders:
.......(back)
2........4........6
1........3........5
.......(front)

Ignition Coil Connections:
........(back)
......._____
3->o|_____|o<-6
......._____
5->o|_____|o<-2
......._____
1->o|_____|o<-4
........(front)

Let me know if this helped, or if you have additional information questions. Feel Free to contact me at FixYa.com!

Firing Order: 3.8L:
1-6-5-4-3-2

Cylinders:
(back of engine)
2------4------6
1------3------5
(front of engine)

Ignition Connections:
......(back)
3--->o...o<----6
5--->o...o<----2
1--->o...o<----4
......(front)

350 Chevy engine in what? 1990 Corvette? Who built it, did you?

Sounds as though you have plug wires wrong.
Firing order is 1-8-4-3-6-5-7-2

Distributor Ignition System:
Distributor rotates Clockwise. (Rotor)
Find Number 1 tower on distributor cap, go Clockwise with Firing Order.

Distributorless Ignition System:
VIEWING the engine from the Front of the car.

Spark plug wire connections along the back, starting from Left side going to Right side;
2-3-7-4

Spark plug wire connection towards the Front of the engine;
6-1-5-8

(To guess I would say you have 5 and 7 wires switched)

Left side cylinder order is 1-3-5-7, going from front to back.
Drivers side is Left side.
Right side cylinder order is 2-4-6-8, going from front to back.

on the side of the oil pan

sounds like firing order wrong