why a car wouldnt start?
- Thread starter Stani1029
- Start date
Shero
Ex. Club Member
x2, or check the spark plugs arnt totally manky. only other thing ever chffed mine was when i ran super unleaded once, did you put diffrent fule in?
OP
OP
Stani1029
Club Member
i know the engine isnt flooded, the plugs arent manky, the leads are working fine, the dizzy is in good nick, its pumping fuel, that there is fuel, changed throttle bodys, looms, injectors, fuel rails, ecu's, checked all fuses, checked compression which is perfect...
very confusing this is
very confusing this is
Alienfish360
Awesome Dawson
take fuel pump fuses out, turn the engine over with start for a short while, put it back in and try again. Then say what happens.
frank
Club Member
thats always the 1st thing i try if there,s a spark but wont start, it,ll run for a few secs (if you have an injector/nats/ecu problem)
frank
Club Member
ive not checked the timing either so what the best way of checking it?
with a strobelight, but if the chains are ok it wont be that, if you soak the airfilter (with petrol) it will run for about 5 - 10 secs (if its sparking ok)
frank
Club Member
could it be a bad earth somewhere?? and how could i test for this??
an in need of help stani
stani, if you remove the fuelpump fuse and clean the plugs then soak the airfilter, it should definately run if the spark is ok (and the valves are ok)
this will rule out an injector sequencing or flooding problem.
if it does,nt run (and the valves are ok) then its a spark sequence or timing problem
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Stani1029
Club Member
ive tried plugs from my other micra and even bought new ones to test
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Stani1029
Club Member
stani, if you remove the fuelpump fuse and clean the plugs then soak the airfilter, it should definately run if the spark is ok (and the valves are ok)
this will rule out an injector sequencing or flooding problem.
if it does,nt run (and the valves are ok) then its a spark sequence or timing problem
i have done the fuse trick and cleaned/tried other plugs. ive tried a dizzy that has a new rotor arm and cap, one thats old and one from my running micra. ive tried different sets of leads which all spark. how much do you think a strobelight will be if it is the timing? but then i always thought a car would start if the timing was out slightly and if its out alot then the valves would be hitting the pistons etc...?
(Y)
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Stani1029
Club Member
see ive tried different throttle bodies, and a ga16 one and a different type lol but now i think i may have the answer, ages ago i removed the carbon cannister when i was re-doing an engine, i remember setting the vacuum pipes up wrong and the car never did start till i got it right, now i cant remember which way i had it so can anyone who has removed the cannister show me which way they have there pipes set up, from the back of the inlet, to the back of the throttle body
cheers
cheers
frank
Club Member
Alienfish360
Awesome Dawson
Do you have NATS? if yes
Does your engine checklight flash when trying to start the car?
Does your engine checklight flash when trying to start the car?
pollyp
Club Member
1) if your engine has a Temperature Vacuum Valve (ie. next to the coolant sensor is a screw plug with 2 thin rubber tubes connected) & below the airbox is another thin rubber tube:
- 1 thin rubber tube goes from the bottom of airbox to one of the two ports on the Temp Vac Valve screwed onto the engine head (supply ambient pressure)
- 1 thin rubber tube goes from behind the TB just above the TB butterfly valve (another ambient pressure tube)
- 1 thin rubber tube goes from the other port of the Temp Vac Valve and meets with the tube from behind the TB using a Y-split (when cold, the valve is open, disabling the emission control system. when the engine is warm, the valve closes to enable the pressure difference from the closed throttle to actuate the canister)
- 1 thin rubber tube from the y-split then goes to the top of the carbon canister (joins the 2 sources of ambient pressure lines to the canisters actuation diaphram)
- 1 thick tube goes from behind the inlet manifold just below the TB butterfly valve to the carbon canister just below the thin tube above ^^
(when throttle is closed, this tube carries the vacuum to the other side of canisters diaphram, actuating it to release the stored fuel vapour into the manifold)
- 1 thick tube running parallel to the fuel lines goes to the other port on the carbon canister(vapours from the fuel tank)
2) if there's no temperature vacuum valve:
- 1 thin tube goes from behind the TB just above the butterfly valve to the top of the canisters diaphram
- 1 thick tube from the inlet manifold just below the butterfly valve to the lower part of the canisters diaphram to supply vacuum when throttles closed, releasing the stored fuel vapours into the manifold
- 1 thick tube running parallel to the fuel lines goes to the other port on the carbon canister(vapours from the fuel tank)
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Stani1029
Club Member
i now think it is timing people, i think ive made a mistake on it which is not like me :O im do remember when i built the engine, i had to take the side plate off again as i missed the tensioner, and normally once ive built an engine i turn it over by hand which is what i think i done without the tensioner in place. i hope to god this is what ive done so i can get on with it
