Ignition problem

[STREET90]

I have a 7mgte cressida, I bought it from a guy who had it sitting for over a year, I had the engine completely rebuilt with ARP/MHG its ready to start, but I'm not getting any spark at all, plugs gapped to spec, I tried pulling out the plugs to see if its arching but nothing at all I tripled checked all my wiring, everything is getting power except the CPS. I checked everything from resistance to power level check from the get go. I even try replacing the cps with a known working one, replaced the male connector with new one and replace all the wiring with new wiring

The connector I'm talking about the connector on the left is not giving any power to cps at all

I checked the coil packed and their resistance is 1.0 to 1.4 instead of TRSM saying it should be 0.3-0.5,
Can it be the coils?

I really need help with, isn't another power source to the cps? my timing has double checked the rotor, it is exactly at top dead center.

I've been trouble shooting this for a week

 

[jetjock]

The CPS uses reluctors. Makes its own signal. No power required.

 

[STREET90]

okay, thats cleared, so why am I not getting any spark to the plugs can the coils be that bad that nothing comes out

 

[Apollonius]

Is your fuel pump coming on?

You wont get spark or fuel until your CPS sends a signal to your ECU its turning. Pull out the CPS and turn it by hand and see what happens

 

[jetjock]

Check that the CEL comes on (confirms power to ECU).

Check that the tach flickers when the engine is cranking (confirms CPS, ECU, and igniter working).

Check that the coil packs have 12 volts (confirms FL AM2 and Ign switch are good)

Check that the igniter body is bolted to the chassis.

Yanking the CPS out and spinning it by hand will save wear and tear on the battery and starter while troubleshooting. Not how I'd do it but then again it wouldn't take me a week

edit: What he said...

 

[STREET90]

I got fuel pump, I turned to the start position and accidently left one of fuel return off the gas squirted all over the place plus there was a strong gas smell every time I crank it,plus the pistons were wet on top so got fuel, the engine cranks as well as the cps, friend verified,

Like I said triple checked everything, ecu getting power, tach is moving, coil are getting volts, everything is bolted down and all grounds are grounded, Tried turning the cps by hand

And by a week, I'm not on the car everyday its been a week since I done the wiring and try starting it

 

[jetjock]

Just to clarify, the fuel pump will work as long as the key is in the start position. The CPS doesn't even need to be in the car for that to happen...

 

[Van]

I got fuel pump, I turned to the start position and accidently left one of fuel return off the gas squirted all over the place plus there was a strong gas smell every time I crank it,plus the pistons were wet on top so got fuel, the engine cranks as well as the cps, friend verified,

Like I said triple checked everything, ecu getting power, tach is moving, coil are getting volts, everything is bolted down and all grounds are grounded, Tried turning the cps by hand

And by a week, I'm not on the car everyday its been a week since I done the wiring and try starting it

When I had this problem, it turned out that I installed the CPS one tooth off. After I realigned the CPS to the TSRM example on page IG-19, the 7M started right up! Try it...
Van

 

[STREET90]

YOu mean like this except I'm off by a tooth, I did exactly like this from the follow up on this forum
besides I think I will at least get a pop or a burp from it if I'm off by a tooth, thing is I'm not getting spark at all no spark plug is lighting up

 

[Van]

YOu mean like this except I'm off by a tooth, I did exactly like this from the follow up on this forum
besides I think I will at least get a pop or a burp from it if I'm off by a tooth, thing is I'm not getting spark at all no spark plug is lighting up

I'll refer you back to the TSRM, encourage you to go thru the troubleshooting section of the ignition system (IG-3) in the TSRM again. Also, check the fuse for the EFI system and all the system's ground wires... Those wires to the CPs look dodgy. Coil pack wire good and tight? the ECU ground wires connected to the intake plenum? Check for corrosion on the connectors of the ground wire. I had to follow the TSRM line by line before I was able to determine cause of the 7M's no start.

 

[STREET90]

update!
engine fires up! turns out that, I miss placed the ground wires on the block instead of the intake manifold,
THanks

 

[Van]

update!
engine fires up! turns out that, I miss placed the ground wires on the block instead of the intake manifold,
THanks

Alright! Now all the fun starts... The 7MGTE is one torque monster. Got any pics of the car? Any numbers from a dyno tune, let us know. Van

 

[jetjock]

.. I miss placed the ground wires on the block instead of the intake manifold...

Putting aside for a moment how you "tripled checked" everything that doesn't make any electrical sense at all...

 

[STREET90]

Putting aside for a moment how you "tripled checked" everything that doesn't make any electrical sense at all...

by wiring i meant the to the chassis of the car to power everything, get ignition etc, At first I thought these ground wires can go to every where that on the engine so I put it on the block held down by a bolt, this was put into a cressida so wiring was a huge a hassle to deal with. I didn't know it would make a huge between differences between the block or the intake manifold

Alright! Now all the fun starts... The 7MGTE is one torque monster. Got any pics of the car? Any numbers from a dyno tune, let us know. Van

I'll Post in the members ride section

 

[jetjock]

..I didn't know it would make a huge between differences between the block or the intake manifold...

That was my point. If the car is wired properly there's almost zero difference between block and manifold as ground. I say almost because, technically speaking, the block is actually the *better* ground. If that's not the case on your car there's going to be problems...

 

[Nick M]

That was my point. If the car is wired properly there's almost zero difference between block and manifold as ground. I say almost because, technically speaking, the block is actually the *better* ground. If that's not the case on your car there's going to be problems...

Another magical fix....

 

[jetjock]

^ Ha. As the thread progresses I'm beginning to understand why the wiring was such a hassle.

I'd like to know exactly what wires he's talking about and how having them connected to a supposedly bad ground resulted in (per post # 6) "ecu getting power, tach is moving" but no spark. Considering the grounds needed to make spark are the same ones none of it makes sense.

I hope he'll explain it because, honestly, it would be a boon in the future when I next try to help someone who has absolutely NFI what they're doing...

 

[Nick M]

I am often not sure what they mean. I ask what do you mean, and they don't say. Because somebody jumps in who speaks greasemonkey and tries to help. Oh well.

 

[STREET90]

^ Ha. As the thread progresses I'm beginning to understand why the wiring was such a hassle.

I'd like to know exactly what wires he's talking about and how having them connected to a supposedly bad ground resulted in (per post # 6) "ecu getting power, tach is moving" but no spark. Considering the grounds needed to make spark are the same ones none of it makes sense.

I hope he'll explain it because, honestly, it would be a boon in the future when I next try to help someone who has absolutely NFI what they're doing...

I thing is I can't explain it, electronics is not my speciality, All I did was move some wires to a different location and voila.

 

[jetjock]

Not your specialty. Huh. So lets see if I've got this straight: After rewiring the car you screw it up, come here looking for a solution, then refute the advice offered by saying you've triple checked everything as if you completely understood the wiring you did and were unable to accept the possibility you made a mistake doing it. Then you're unable to explain the mistake you were incapable of making yet did. Furthermore you appear unconcerned the fix indicates you did yet something else wrong which may result in your car burning to the ground. Does that sound about right?