Popps then Shuts Off again.

robw13 · Jul 4, 2025

My mechanic just got the Ign Module replaced and the car pulled the same crap again.
Going down the road, heard/felt a pop, lost power and engine light. Would crank but no start. After sitting for 10min, fired back up but feels like it's got a miss/fluctuating idle.
Any ideas?

90 mustang gt vert. 5sp 5.0l

General karthief · Jul 4, 2025

Fuel pressure?

robw13 · Jul 4, 2025

Not sure, should have enough. I think it's a something ign related still.

General karthief · Jul 4, 2025

It should but does it?
I hesitate, you have a mechanic working on this?

robw13 · Jul 5, 2025

Yeah, didn't do anything when he had it last.

AeroCoupe · Jul 5, 2025

Have you checked to see if there are any codes? CEL only illuminates for emissions related codes so other codes can be present and you will not get a CEL.

General karthief · Jul 5, 2025

Are you going to work on this issue yourself?
I ask this because when I hung around the 'shop' that my friend had, people came in with 'I googled this and it said to replace this part' or 'my friend told me to have you do this....' keyboard mechanics can be useful to the DYIer, not so much at a repair shop, they should know what to do but sadly not many mechanics know how to diagnose our older cars.
I would check out this thread :

Cranks OK, but No Start Checklist for Fuel Injected Mustangs

Cranks OK, but No Start Checklist for Fuel Injected 5.0 Mustangs model years 1986-1995 A word about this checklist before you start: it is arranged in a specific order to put the most likely failure items first. That will save you time, energy and money. Start at the top of the list and work...

www.stangnet.com

This checklist is useful when the car dies and won't restart so you have to run the checklist when it dies,
There are some quickie things to do when it dies (may be cover in the checklist) a shot of starter fluid will tell you if it's running out of fuel or a no spark condition.
The ignition switches, the electronic switch under the dash on the lower part of the steering column, is known to fail so get out the flashlight to see if it's loose or burnt connections.
Let us know what the plan is.

robw13 · Jul 5, 2025

Cool beans, I didn't get a chance to cut I was on the hwy when it died. Had it towed. My mechanic is old school thankfully, hates the newer stuff

robw13 · Jul 9, 2025

Update:
Replaced Distributor - Pickup was failing. Gonna replace Coolant Sensors too. Runs fine with Temp Sensor unplugged.

gkomo · Jul 9, 2025

What distributor did you replace it with?

robw13 · Jul 9, 2025

Only one close to here was a Duralst Gold, Steel Gear. I'm sure it may not last though

General karthief · Jul 10, 2025

robw13 said:
Only one close to here was a Duralst Gold, Steel Gear. I'm sure it may not last though

Why will it not last?

robw13 · Jul 10, 2025

Idk lol, just overthinking i guess. He said its running better now, but have to replace the Temp Sensors. Says it runs/idles great when the temp sensor is unplugged.

robw13 · Jul 14, 2025

Changed Distributor, no change, alot of jerk/popping when driving slow and dies. Will not staying idleing/dies. Scanner also showed both temp sensors faulty. I've changed the ect so far, no change. Waiting on the gauge one though.
What else too check? Possible wires or bad dizzy/Icm? Its running rich too, can smell it alot.

Noobz347 · Jul 14, 2025

AeroCoupe said:
Have you checked to see if there are any codes? CEL only illuminates for emissions related codes so other codes can be present and you will not get a CEL.

If you have temp sensor issues, you should have codes to go with them.

robw13 · Jul 14, 2025

Mechanic checked em, I didn't ask of course lol.

Noobz347 · Jul 14, 2025

Buy yourself an OBD1 code reader and a multi-meter and get back to us...

or have your mechanic join Stangnet.

In seriousness, there is no way for us to help you over the internet if we don't have information. At this point, I would leave it in the hands of your mechanic to solve.

View: https://youtube.com/shorts/byg8jtZ4vOU?feature=shared

robw13 · Jul 14, 2025

Agreed, I got one coming, will update after learning codes and what not.

General karthief · Jul 15, 2025

The temp sender will have no effect on how the engine runs, it only works the gauge, the engine temp sensor (notice the word change?) that mounts in the heater tube talks to the computer. They rarely go bad but it does happen. Wiring would be suspect if you get a code for a ECT fault.
Your mechanic knows this. Now you do too.

robw13 · Jul 17, 2025

Changed both sensors & dizzy, idles little better but the rpms will drop now and then. Haven't driven it yet. Only codes on 1st test is 10,11,18.

The main issue that started this mess is it suddenly lose power/stall going down the road and would have to wait 5-10min to fire back up. Would just crank over.

Popps then Shuts Off again.

robw13

General karthief

wonder how much it would cost to ship you a pair

robw13

General karthief

wonder how much it would cost to ship you a pair

robw13

AeroCoupe

lube between the nut and the face. I know my lubes

General karthief

wonder how much it would cost to ship you a pair

Cranks OK, but No Start Checklist for Fuel Injected Mustangs

robw13

robw13

gkomo

now i can hopefully expect to receive the shaft

robw13

General karthief

wonder how much it would cost to ship you a pair

robw13

robw13

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

robw13

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

robw13

General karthief

wonder how much it would cost to ship you a pair

robw13

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Popps then Shuts Off again.

wonder how much it would cost to ship you a pair

wonder how much it would cost to ship you a pair

lube between the nut and the face. I know my lubes

wonder how much it would cost to ship you a pair

now i can hopefully expect to receive the shaft

wonder how much it would cost to ship you a pair

Stangnet Facilities Maint Tech... Er... Janitor

Stangnet Facilities Maint Tech... Er... Janitor

wonder how much it would cost to ship you a pair

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