no spark?

[!kid]

if i set a pluged in spark plug ontop of the valve cover i should see a spark right ?

[dashboardmonkey]

as long as the body of the plug gets a good ground, then yeah

[ZombiE30]

I used the intake manifold because it's not covered in grease/grime like the valve cover, which often makes for an iffy ground.

But yes, that should work.

[!kid]

cool thanks

[whiltebeitel]

I usually let it sit on the exhaust manifold, since it's never painted, and whenever I find myself testing for spark, the car is usually cold.

[!kid]

so have this problem, iam not getting spark. i have a new cap & roter, the crank trigger ohms are with in spec, coil is good and is getting power and has ground. but i have no spark. any ideas? also my thermostat housing is not bolted on so the two sensors are just resting on the valve cover. is there a way to test the ECM?

[ZombiE30]

Actually, I don't know of a way to test the ECM itself. The Bentley has a suite of tests at the ECM connector, but that is just to make sure the ECM is getting proper input; it does not test the internals. Still, I recommed doing those tests.

Is your no-spark condition temperature dependant?
The transistors in the ECM are all 20+ years old, and increasingly cranky when it comes to their preferred operating environment. (I currently have a no-spark condition, fixed by heating the ECM itself prior to driving.)

I'm assuming you tested for fuel, and are getting fuel to the rail and the injectors are opening and closing....

Also, not sure if the temp sensors in the thermostat could cause this, but I'd put those back first just to make sure.

[!kid]

i have not checked for fuel,dont see how that could effect spark but its always a good thing to check i guess. one cold morning i tried to crank it and nothing worked battery had 12v and nothing would turn on. later that day tried again it had power but still no spark. thanks for your input. when i get off work tomarrow ill put the thermostat and sensors back on to see if it helps any. ill also test the ground and power at the ECU.

i miss driving my baby

[JMPAuto]

Check you crank position sensor and also make sure your fusible link is good. Check for voltage at the smaller wire at the distribution block.

[!kid]

Check you crank position sensor and also make sure your fusible link is good. Check for voltage at the smaller wire at the distribution block.

i have checked the crank trigger already the Ohmn reading is with in spec. fusible link ? is that the two fuses near the fuse box ?

its raining so i cant work on my car tonight

[lennon]

fusible link is in trunk. check for fuel so you'll know what else to check. if you have fuel its not ECU or crank sensor related.

[ZombiE30]

fusible link is in trunk. check for fuel so you'll know what else to check. if you have fuel its not ECU or crank sensor related.

not true. If he has fuel, it is not crank sensor related (as you said). But it still could be the ECU.
On a cold day, mine will jizz fuel everywhere but yield no spark.....until I get the ECU warmed up.

Then all is good.

[!kid]

so the rain let up and i got a chance to make some tests, its a ground issue. i tested for power at the ECU connecter pin 18 and 35 all was good i had 12v. i tested the main grounds with ignition off at the same connector i did not have ground at pin 5,10,16,17. only have ground at pin 19.

do you have a pic of this fusible link ? i cant really think of anything like that in the trunk

[JMPAuto]

If the fusible link is gone then you will not get spark and fuel. Its in the trunk, its like 1 foot from the positive battery terminal on the smaller wire. Just check for 12v on the smaller wire together with the main wire going to the distrbution block, if there's no voltage then fusible link is gone.

[!kid]

oops i was looking at the wrong table in the book. i do have power and ground at the ECU. main relay is good i checked that. fusible link is also good.