i go to turn the car over and i let it crank acouple times then boom loud a$$ back fire. it did it the three times i cranked it. all plugs wires on coil and plugs are correct. are wiring is correct. the delteq box's led blinks once like it should. then it stays lite while trying to crank the car over and when i stop it stays lite. so whats wrong???? help i want to drive my car......

 

If you're absolutely 110% sure that your wires aren't crossed, then you're probably looking at a dead optical sensor

 

i took all the wires off and traced them twice- they are correct- haha

hmm you mean the opti spark optical sensor is bad

 

anyone else have any ideas.........

 

i would guess the spark plug wires are in the wrong order but if you say they are right then idk

 

yeah they are fine and all snapped on, now if the opti sensor was bad the delteq boxs led would act up which it isn't

 

i have noticed with the delteq, i am now getting delayed starts. and yes, 1 out of maybe 12 starts produces a backfire. everything is wired per instructions. interested in a solution.

dont know if tuning will cure it, but i am meeting with bry from pcmforless next week for a dyno tune. i will bring up the issue with him and reply with result.

hope it helps

jb

 

JB- mine backfires will i'm trying to crank it over, is that what yours does too?

 

If ya crank and crank on it,it confuses the box. Ya have to turn the key off and count to 15 then try again.It will reset and do right. If it don't fire and ya quit cranking and leave the key on and then crank some more is when it does it.

All the ones I have fooled with will do it.

 

okay , but still have no clue why car won't start?

 

affirmative. i always let my fuel pump cease prime before i turn the motor over. with opti, start was immediate. now with delteq, start takes approximately 3/4-1 sec orso. and as i stated, once in a while, a great pop.

jb

but after cranking, the car runs normally. starts every time. as i said also, i just have minor tuning issues right now, i dont think its delteq related. as far as your car not starting, i

 

does it take acouple mins for the system to read the signal from the opti spark? i would figure it would have started right up on the first turn?

 

A slightly longer cranking time is documented in the Delteq manuals.
This is to be expected.

With the stock system, even when the engine isn't running, the cap and rotor know exactly which cylinder is the next cylinder to be fired because the rotor is mechanically connected to the camshaft.

With the Delteq, at startup, it has to calculate which cylinder is coming to TDC from the Opti-Spark pulses. So the Delteq does not know which cylinder to fire until it can detect the first of the four (there are 8, 4 variable and 4 with the same duration) variable-width low-res pulses. This does take some time. But, on mine, the longer time is not objectionable.

On the other subject of backfiring, I have only once been able to produce that -- when I started to crank the engine and stopped cranking before it started.
An inductive discharge (as opposed to capacitive discharge) ignition system fires the coil when the primary current is interrupted to that coil while the coil has been charged. When an ignition coil is charged, it has a magnetic field built up around the coil. When the primary current is interrupted, that magnetic field collapses and cuts both the primary and secondary (high voltage) windings producing a voltage that fires the plug. When you turn the key off, the primary current may be prematurely interrupted causing the plug to fire at the wrong time -- normally, the Opti-Spark pulses would cause the plug to fire at the appropriate time.

Tom Piper

 

i installed delteq per instructions, and had no ignition issues whatsoever after install. swiss clock...

jb

other than the delayed start and intermittent backfire.

 

maybe i didn't give the system enough time to read the opti signal and turn over? makes me kinda worried though, i hate to keep cranking the car over if i still can't get it to start.