1998 Mustang GT 5 speed jerking/hesitation

blackdemon007

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Hello guys,

To start off this is my first post (glad to be a part of the community), sorry it has to be a problem, but maybe you can help me and hopefully I can help you all in the future.

Anyway, let me give you some background info (sorry for the length but just trying to help)

Car on stock tune:
Had a real bad exhaust leak - ordered parts and took it to a shop for installation.
On the way to the shop car started jerking (both while accelerating and cruising) on the interstate near my exit.
Got off on the exit - car still jerking - then it died and wouldn't start, guys from the shop put it on a car dolly and took it to the shop.
Came up the next day with my tuner (SCT X3) and pulled codes (P1000 - OBD Systems readiness test not complete)
I cleared the codes and car started right up.

Had the entire exhaust replaced with longtubes, new cats, 2.5" pipes into slp resonators, also a new egr tube and O2 Sensors.

Picked up the car from the shop and during the drive home it was fine in the city.
Got on the interstate and car started jerking again, got off on the next exit and car died.
Had family bring my tuner up - cleared the codes (P1000 and P1260 - Theft Detected, Vehicle Immobilized) and installed my new tune for the exhaust - car turned over but wouldn't start back up - had it towed home.

Installed new coils and plugs - car still wouldn't start and backfired while trying.
Put the car back to the stock tune and car started - now no codes.
Took it for a test drive, not real far just in case, and noticed car jerked every now and then but definitely not as bad and still no codes.

Thinking possibly the MAF but not sure, any help would be appreciated.

Thanks Everyone.
 
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blackdemon007

blackdemon007

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For anyone who cares, here's an update.

Replaced the MAF, no luck.
Started looking around and found that my Crank Position Sensor had oil all over it, removed and reinstalled, and cleaned the connector with contact cleaner.
This helped a lot but still had some jerking when I hit a big bump in the road.
Found that one of my ignition coil connectors had a broken tab, ordered a new one (suppose to be here Wednesday) and hopefully that takes care of all my issues.
 

vaffanculo313

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any luck ? i have same problems as you except i notice it more when car is warm. On a cold start shell pull hard once it warms up jus revs high then finnaly kicks in.
 
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blackdemon007

blackdemon007

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Ok, so the coil connector was definitely the jerking problem ran fine yesterday, but today I went to leave home again and my car wouldn't start. This time I got a code P0320, from what I read this is usually the CKP, so I ordered a new one along with the connector, thinking maybe the oil is causing the old one to go bad even though I cleaned it.
Maybe one day I'll wake up and not have a problem. (it could happen)
 
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blackdemon007

blackdemon007

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Finally a positive update.
The Crank Sensor and connector seems to have done the trick, no more jerking, shutting off and my car is starting.
 

MustangChris

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sorry that your thread slid under our noses!

nice work on tracking out down. and thanks for keeping us updated! a lot of folk find us from Google searches. and it's nice when they can find answers to similar problems. :)

welcome to the forum! we'd love to see your stang.


and you get kuddo points from me for keeping your cats and egr. :)
 

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