Engine cut out at cruising speeds.

[VaShelby]

As title says. Engine cut out at steady cruising speed. seems more around 3000 rpm range. It has a Boost Button Double Play cal. 10 and 18 psi. and a three bar map. Things I have checked or replaced in an atempt to resovle issue.
This is in my 89 Shelby Daytona 2.2 1. Switched back to stock smec and map- no help - Its not you Boost Button
2. Swapped out hall effect with one out of my 88- no help
3. Replaced coolant temp sens.- no help.
4. swapped out 3 bar with brand new one.-no help.
5. Replaced coil with known good coil.- no help

The only things I have'nt checked are O2 and maybe the ASDR?
I have a innovate AFR meter and wide band installed in down pipe but not hooked to smec.

[tryingbe]

Does the dash cut out too?

[VaShelby]

No. but the tach drops but not all the way. its a split second kinda thing.No lights dim or anything like that.

---------- Post added at 09:48 PM ---------- Previous post was at 09:44 PM ----------

It also goes pig rich when this happens. Forgot to mention this.

[Abkshelby]

That car had a problem with the connector at the fuel pump at one time causing it to cut off.
Not sure if it ever got fixed properly.
ASD relay usually just fails completely but you could swap another one in to check.
Unless the wiring to the O2 is burnt up probably not an issue there. Fairly new O2 was in the car when Sean had it.
Club meeting is Wednesday this week if you want to come discuss it.

[VaShelby]

Sure thing. The ASD in the 88 has diff. housing. wont fit on connector. The O2s plug pins looked a little burnd but was dark by the time I got to them.I could just discard the stock one an connect new wide band cant i?

[shackwrrr]

Sounds like a eprom connection issue. My ostrich will do this if the wire is too close to the battery cable.

[VaShelby]

 Sure thing. The ASD in the 88 has diff. housing. wont fit on connector. The O2s plug pins looked a little burnd but was dark by the time I got to them.I could just discard the stock one an connect new wide band cant i?

---------- Post added at 10:19 PM ---------- Previous post was at 10:16 PM ----------

An eprom issue. You mean in smec. Tried old smec and cal'd smec to no avail.

[Abkshelby]

I dunno anything about that wideband stuff.
Only mods I do to these is an MP computer and nothing else.

Seldom ever have a problem in the SMECS other than the power module part doing weird stuff but you swapped them and no improvement.
Check all the grounds under hood again. Something may be loose since that entire harness was removed and reinstalled at one point.

[VaShelby]

Will do that tomorrow. Was thinking about ordering one of those engine grounding kits as well. The old braided stuff is looking a little rough. Well thanks for help AbkShelby. Will see you at meeting wensday. Till the I will check grounds and look over wire diagrams again.

[VaShelby]

can i get electrical diagram from some one on here. 89 Daytona , Shelby. Need diagrams for coolant temp sens and ASD

[cordes]

I had the same problem in my Daytona this past summer. Do you get any codes? Mine was throwing the code 54 for the HEP, but I believe the alt was throwing off a funky wave and causing voltage problems to the SMEC which threw off the HEP signal voltage.

If my alternator hadn't died on the way home I would have never found the issue. I had it towed the rest of the way back from SDAC, did nothing but replace the alternator and it hasn't done it since.

[VaShelby]

well Im getting an O2 code now . But wasnt showing any till tonight. I unplug 02 earlier and pluged back in. then cleared code. but it came back again. Wonder if alt ground is bad. will check output tomorrow along with grounds . thanks for input . thats the second time the alt has been mentioned.

[VaShelby]

Pulled apart 0s connector and found some bad pins

huuumm could this be the culprit?

[cordes]

That certainly isn't helping the situation!

[ShelGame]

I had the exact same issue with my old minivan. It would drive fine, then sometimes cutout, sometimes not start etc. It turned out the main ECU ground wire was screwed to the body right under the battery tray (where it was basically invisible with the lower splash covers on). The screw had backed out and so the wire was only touching occasionally. When it would stop touching the body is when it would cut out. I would definitely be looking for a bad/disconnected ground wire. If this is the case with yours, I don't think one of those engine grounding kits would help.

[wheming]

You know, now that you mention your issue, it reminds me... When i was driving MeanMini down to NC from CT when i first got her, she did this on the highway a couple times. Kinda scared the crap out of me from the standpoint of not wanting to be stranded hundreds of miles from my destination!
Although i never determined the cause, i attributed it to bad gas from it sitting for the better part of 8 years. It has done it several times, but had not done it much in the last 6 months or so of driving it. I had not replaced any electrical tidbits.
So thanks for the information here, I'll look at those same areas during the engine and tranny replacement.
:beer:

[VaShelby]

Thanks Shel !!!!!! I will check. Its gotten worse since I put the poly bushing motor mounts in. All the extra vibration could cause something like that to get real bad.

[VaShelby]

Well for all you guys wondering where I have gotten with this issue. Its seems to have been the baro solenoid. removed it from the system and eveything seems to be better. Will know for sure tomorrow. I think I still need to replace some vac lines and such but no more silly sh-t going on with AFR.

[cordes]

Well for all you guys wondering where I have gotten with this issue. Its seems to have been the baro solenoid. removed it from the system and eveything seems to be better. Will know for sure tomorrow. I think I still need to replace some vac lines and such but no more silly sh-t going on with AFR.

That's great to hear. The baro solenoid gave me trouble in my Daytona a couple of years ago, but it threw a code 13 in the process so that made it a little easier to track down.

[turbovanman²]

Well for all you guys wondering where I have gotten with this issue. Its seems to have been the baro solenoid. removed it from the system and eveything seems to be better. Will know for sure tomorrow. I think I still need to replace some vac lines and such but no more silly sh-t going on with AFR.

I was going to suggest you bypass that, had that exact issue years ago, I almost took a torch to the van, found it by a total fluke.