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740 will not crank 700 1985

OK, now I've done it! But I'm not sure what. Problem: car will not crank over.

What I have done:
I took the intake off and inspected wiring harness, tested ECT (OK), Knock wiring and condition (OK), temp gauge sensor (fixed stripped wire to it), fixed a couple of stripped wires (three at the back of the alternator and one small one on the front of the starter solenoid - for this one I reran a new one from the back of the alternator to the solenoid), cleaned out intake, checked the "clicking" sound of the TPS (OK), put new intake gasket on and reattached intake and all connections. Re soldered battery "+" wires to battery clamp. Changed oil/filter, rad flush and reinstall with new hoses, installed missing water thermostat, replaced broken rad reservoir cap.

Car will not even crank over.

What did I check:
The fuel relay appears to be not working that is I can jump between #30 and #87 terminals on the relay board and hear the pump running but when the relay is installed and key turned to run position there is nothing much happens except a single click from the fuel relay and an oil light comes on on the dash and after about 5 seconds or so there is another relay click by the glovebox and the heater fan comes on really slow. There is power at the alternator red main larger cable and also at the same sized red cable at the solenoid. No power at the coil.

I am worried that the ECU is damaged or something major and this is going to get realy expensive. I purchased the car a week ago and it was running then but was low on power, took several seconds cranking to start with a bit of throttle required, idled but poorly (had to keep a bit of throttle on) would not warm up properly, when the accelerator was reved up the car would want to sputter and die and then would "backfire".

The car is destined to become an ice racer this winter (http://members.rogers.com/scoty/icerace.htm - my ice race page) and will never be road driven again. I will tow it to the track where it is left and only used to race artound a 1 km track for 12 laps during 10 races very weekend for 6 weekends in a row starting Jan 17th, 2003. Therefore it does not have to meet any certifications, etesting, emmission standards etc etc etc. I just want it to start evrytime and run smoothly after it has warmed up. Any and all modifications that can be done to simplify the starting and running of this vehicle for the purpose of racing it in Minden, Ontario, Canada at temperatures of up to 40 below zero are welcome!

THank you in advance, I need help!








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740 will not crank 700 1985

I also have an 85, they are prime candidates for deteoriating engine wiring harness. Look here for further discussion. I replaced mine with used one for $160.

http://www.brickboard.com/FAQ/700-900/ElectricalCircuitsRelays.htm#BakedEngineWiring700200Cars








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740 will not crank 700 1985

Just yesterday I had the same problem on my '86. It turned out the small wire on the starter solenoid had broken off(BL/GR).This is the wire from the start position of the ign switch.
I just crimped on a new terminal and pushed it on term 50 of the solenoid.
My wire harness is in pretty bad shape as I've had other problems with it.
Hope this helps.
John








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740 will not crank 700 1985

found the problem!!!
Batterry terminal clamp notmaking great contact and I had wired the starter wire incorrectly.

Car runs great but too much noise from Main fuel pump

Now I am going to test to see if inline pump is functioning.
thanks








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740 will not crank 700 1985

"Re soldered battery "+" wires to battery clamp"

Solder doesn't belong in an engine compartment due to low melt point. Given the size of the wires I think you would need a very large iron to get it even remotely hot enough for a good solder flow. Get a heavy duty cable end and clean throughly the wire ends and attach, There are several small wires getting 12 volts along with the + to starter.

Note: Larger red from battery goes directly to solenoid. Medium red from alternator goes directly to battery.

"for this one I reran a new one from the back of the alternator to the solenoid"
Is this where it was origianlly? My small green wire from solenoid (87 740) goes into harness but doesn't connect to alternator. Check ground wire from block to alternator.








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740 will not crank 700 1985

oh yeah:
also replaced plug/coil wires and plugs.








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740 will not crank 700 1985

do you mean it won't turn over (start), or do you mean it won't crank at all? if it doesn't crank at all, maybe it's the starter?
--
Kenric Tam
1990 Volvo 740 base sedan (B230F)
My Volvo 'Project'








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740 will not crank 700 1985

It won't crank at all, as if it were the starter, but this was working fine before I did all the work to it...







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