I have posted this before and still no one has come up with a solution!!
I have a late 92 n/t talon(i.e. 7 bolt) and I did a 6bolt swap. Ever since, I have not been able to make it run right . It idles fine but runs rich, and when it's at WOT the engine will not rev past 3500-4000 rpm's. I have changed every concivable sensor and control modual I can think of, and still there is no diff. I've even tried around 6-7 diff. ecu's...Nothing!!!!!
I have some one interested in it, but he wants it running. So please help with any idea!!!!! I don't care if it's a long shot, I need some input....fast!!

Steve,

limp mode, nuff said... that explains the rev limit and the rich idle. you say 7 bolt? the years dont exactly match up, but what CAS are you using and is it correct for the year ECU your using?

Originally posted by zac83
limp mode, nuff said... that explains the rev limit and the rich idle. you say 7 bolt? the years dont exactly match up, but what CAS are you using and is it correct for the year ECU your using?

Click to expand...

Nope that's not the problem......Next!!! And also pay a little more attention to the post, It's a 7 bolt car (5/92) that I installed a 6 bolt motor in..

Thanx for being a contestant on name that problem!!

Steve.

2 quick questions:

1) You replaced the stock non-turbo 7-bolt with a turbo 6-bolt? or another non-turbo?
2) Did you plug your MAS back in?

Originally posted by fivestardsm


Nope that's not the problem......Next!!! And also pay a little more attention to the post, It's a 7 bolt car (5/92) that I installed a 6 bolt motor in..

Thanx for being a contestant on name that problem!!

Steve.

Click to expand...

If you are going to be an ass...at least you could tell us why that isn't the problem (CAS)...

Originally posted by Tevenor
2 quick questions:

1) You replaced the stock non-turbo 7-bolt with a turbo 6-bolt? or another non-turbo?
2) Did you plug your MAS back in?

Click to expand...

Ooops, I forgot to mention , N/T and yes I Pluged the MAS in.
All the sensors have been changed and rearranged from 6 or 7 different donor cars 6 and 7 bolts no combination will work so far.


Thanx, Steve.

The symptoms are very close to a bad MAF. However I am guessing you did in fact swap that out for a known good MAF?

Originally posted by LandoAWD

If you are going to be an ass...at least you could tell us why that isn't the problem (CAS)...

Click to expand...

Agreed.

Originally posted by LandoAWD

If you are going to be an ass...at least you could tell us why that isn't the problem (CAS)...

Click to expand...

I wasn't trying to be an "ass", Just trying to put a little fun into a problem that piss' me off.


Steve.

Guy's , please don't turn this thread into one that every body doesn't want to read. All I want is some help.

Steve.

Originally posted by Tevenor
The symptoms are very close to a bad MAF. However I am guessing you did in fact swap that out for a known good MAF?

Click to expand...

Yup did that, Several times.

Steve.

Originally posted by fivestardsm
Guy's , please don't turn this thread into one that every body doesn't want to read. All I want is some help.

Steve.

Click to expand...

Don't worry about this getting out of hand. If it does, I will move it appropriately.

So known good MAF, ECU, and throttle body w/ sensors gets you no where, correct? What injectors are you running?

Originally posted by Tevenor



Don't worry about this getting out of hand. If it does, I will move it appropriately.

So known good MAF, ECU, and throttle body w/ sensors gets you no where, correct? What injectors are you running?

Click to expand...

Yup, all the sensors are working and the injectors are the stock n/t injectors out of the 7 bolt. I have changed them out several times. The throttle body is also the 7 bolt's, I've also changed it several times from the 6 bolt's to the 7 bolt's.

Steve.

Originally posted by LandoAWD

If you are going to be an ass...at least you could tell us why that isn't the problem (CAS)...

Click to expand...

I changed the CAS with several different ones that I knew were good. Both from the 6 bolt's and the 7 bolt's.

Steve.

well thoes are all the symptoms of limp mode... why is it not in there? get a scantool on it if its obd and physicly see whats screwed up (you do understand what limp mode is...?)

if sensors are good and ecu is good, you've gotta have a short somewhere.

Originally posted by zac83
well thoes are all the symptoms of limp mode... why is it not in there? get a scantool on it if its obd and physicly see whats screwed up (you do understand what limp mode is...?)

if sensors are good and ecu is good, you've gotta have a short somewhere.

Click to expand...

I scanned it by using a multi meter, (like the man. desribes) and the only code I came up with was a TPS. I checked it and it was in the tolerances. I even changed it with another that came off a running motor, and It still didn't work. That was the last I did to it.
I do understand "limp mode" Thats why I changed the ecu's. I don't believe, from what's been changed so far, that this is the problem. I know that people have done swaps like this, I just don't understand why it's not working for me.
Are there any sensors or such under the dash that might be causing this? I know that there are sensors and relays that haven't been changed, but I'm not sure what they might be. My last resort might be doing a complete harness swap to a 6 bolt harness. Not really looking forward to that though!! like I said A Last Resort!!! .

Thanx, Steve.

And also, there was no offence ment by the post earlier!!!

Originally posted by fivestardsm


I scanned it by using a multi meter, (like the man. desribes) and the only code I came up with was a TPS. I checked it and it was in the tolerances. I even changed it with another that came off a running motor, and It still didn't work. That was the last I did to it.
I do understand "limp mode" Thats why I changed the ecu's. I don't believe, from what's been changed so far, that this is the problem. I know that people have done swaps like this, I just don't understand why it's not working for me.
Are there any sensors or such under the dash that might be causing this? I know that there are sensors and relays that haven't been changed, but I'm not sure what they might be. My last resort might be doing a complete harness swap to a 6 bolt harness. Not really looking forward to that though!! like I said A Last Resort!!! .

Thanx, Steve.

And also, there was no offence ment by the post earlier!!!

Click to expand...

I'll take a stab at this...
Have TPS code, checked: within spec. By this do you mean you checked it with an ohmeter, or did you check the voltage as seen by the ECM at the ECM connector? (the latter being a good way to find bad connectors, reference voltages and grounds). This might explain the TPS code, while replacing it won't change anything. Anyway, I'd look in the wiring at this point. I'm thinking you left off a ground somewhere or bent a pin reconnecting something. Another possibility is that you may have pinched a wire bolting some part on.

Originally posted by mrmadmax


I'll take a stab at this...
Have TPS code, checked: within spec. By this do you mean you checked it with an ohmeter, or did you check the voltage as seen by the ECM at the ECM connector? (the latter being a good way to find bad connectors, reference voltages and grounds). This might explain the TPS code, while replacing it won't change anything. Anyway, I'd look in the wiring at this point. I'm thinking you left off a ground somewhere or bent a pin reconnecting something. Another possibility is that you may have pinched a wire bolting some part on.

Click to expand...

I checked it with an ohmeter at the TPS, I then checked the plug for the voltage and it was within the spec range. I didn't figure thatI had to check it at the ECU, considering that the voltage was right at the plug. The only ground(s) that would of been taken off (to my knowledge) is the one on the back of the intake plentum. The only other ground(s) that I can think off is the one to the trannie. Unless there is a coroded one on the firewall with the relays, But I can't picture it because the car only sat for a couple of months after the guy bombed the motor, and none of the interior grounds have ever even been touched. Are you suggesting the ground at the ECU connector? Oh.....And after I changed the TPS, the code went away till I started it back up several times. As in I started the car, let it run for a few, shut it off checked the codes and it was gone,(twice) then after it was started again, it came back.

Thanx, Steve.

wait, so you have a turbo MAS....Did you run the nessecary additional 7th wire to the ecu? Did you run the knock sensor to the ECU?

Sean

Originally posted by ItsStockOfficer
wait, so you have a turbo MAS....Did you run the nessecary additional 7th wire to the ecu? Did you run the knock sensor to the ECU?

Sean

Click to expand...

No turbo MAS, it's a n/t 6 bolt motor in a n/t 7 bolt car!

Steve.

Well iI checked more grounds and still nothing. If anybody else has an idea, please let me know.

Steve.

7bolt n/a to 6bolt n/a why? thats a rhetorical question dont answer. I'd repost, im betting most people thought you went from 7bolt n/a to 6 bolt TURBO.

Originally posted by roadtalontsi
7bolt n/a to 6bolt n/a why? thats a rhetorical question dont answer. I'd repost, im betting most people thought you went from 7bolt n/a to 6 bolt TURBO.

Click to expand...

Actually I'll answer because there is probably a few of you that are wondering. The 6 bolt was a good running motor that came out of a totaled car with lower millage on it. And at the time I didn't have another 7 bolt block that I could of used. So I just figured... Anyway, that's the idea behind it. Maybe I should of thought about going turbo!!! Oh-well.

Steve.

We had a car in the shop that was overcharging at random intervals(spiked). It killed two ecu's/ tps 4 injectors and mas before we found it.If that helps in any way...I assume the swapped ecu's were put back into the running cars and were ok?
hope you find it
jd

Originally posted by j.d.roost
I assume the swapped ecu's were put back into the running cars and were ok?
hope you find it
jd

Click to expand...

Yup there all ok. I don't think that there is anything shorting out wich will burn up the sensors, but then again I'm not sure whats wrong yet. What a PITA!!!

Steve.