North American Turbocoupe Organization

Jerking under Acceleration.
AnhDaman Offline
Junior Member
As such with older cars things are bound to go wrong. My 88 Bird has an issue when under full load from the motor, to slightly jerk forward. Our family's van had a bad rear end that we replaced not to long ago with a similar issue however it made a loud humming noise at speed along with it. Mine is not humming however it is making this jerking. I am not sure what to check out and any input on the subject would be great.
1988 Turbo coupe, K&N filter, Boost Controller, Stinger 3" exhaust.

Jeff K Offline
By "full load" when exactly do you mean? Is the jerk at a given RPM? given boost pressure? given throttle opening? Is it dependent on engine temperature? Please provide us with specific details.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized

AnhDaman Offline
Junior Member
By full load I mean full throttle. I need to drive it soon its not really noticable at half throttle however under full throttle you can tell. It will do it cold. I use it for every day driving so I have been babying it and not really opening it up much. However when I go to the store later I will give you a better analysis.
1988 Turbo coupe, K&N filter, Boost Controller, Stinger 3" exhaust.

zbird Offline
Posting Freak
I would check the fuel pressure if it is doing it under full throttle only. Fuel starvation could cause this. Use this link, its the Fuel System Diagnostics to check everything.
Dom Z
88 T/C med grey. 140 MPH Speedo, Kirban FPR, Gillis valve,Tripminder, K&N.
87 T/C Silver, Auto (project Daily driver)
99 F150 4x4
14 Ford Escape 2.0L Turbo
88 T/C
87 Silver

AnhDaman Offline
Junior Member
At higher speeds its more prevalent, however but it would link with the fuel pressure like you said zbird. I am sure the fuel pump and everything is still original so I wouldn't be surprised if it was it. I couldn't make it do it today. So I don't know what was up. I will defiantly give that a check however.
1988 Turbo coupe, K&N filter, Boost Controller, Stinger 3" exhaust.

Not B Anymore Offline
You could be looking at something as simple as some over-gapped plugs so you might want to check them, but the fuel diagnostics is a good idea.
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels

BornInAFord Offline
Junior Member
I had a similar problem a few years ago on a different car (Escort) and it turned out to be the TPS (throttle position sensor).

1988 TurboCoupe 5spd, 160K miles, original condition, silver with dark blue interior. Beautiful and fun car.
1966 Mustang A-Code, 446K miles on chassis, 100K on carbed 5.0L, T5Z, in family since new.
Born in a 1955 Ford, I bleed Ford blue.

AnhDaman Offline
Junior Member
Well. I apologize for a really late response. Problems on the homestead.

However I have yet to really diagnose it however under heavy acceleration it does the jerking along with really aggressive maneuvers. I tried to do a donut in a parking lot and it just started to sputter and act up while it jerked hard out of it. While backfiring. I think this is the same problem. I have also noticed my car backfires some upon shifts when it is doing this surging. I turned down my Boost Controller to 15psi as anything above it would just cause it to act up.

I am having more free time in the upcomming days and I can get to seeing what zbird said. I will also look what everyone else suggested. Thank you.
1988 Turbo coupe, K&N filter, Boost Controller, Stinger 3" exhaust.

turbo80sdriver Offline
Don't mean to be simplistic, but some simple checks are to check timing and ensure your distributor hold-down bolt is secure - I just went through very similar symptoms with my resurrected BlueBird... all's well now, and for no $ at all!
'88 TC-Black T-5 with 79K stock 98.5% original, just w-i-d-e rims and tires, and some under hood powder-coating
'88 TC-Blue w/98K. Stocker w/t-5 ( the resurrection car) top gas mileage =31 mpg!
'88 TC-Grey w/99k. Auto, well optioned, 2nd owner car - getting more options
'87 TC-Blue w/123k t-5 parts car - less of a car now
'88 TC gray- body only so far- very very late factory build dated car, awaiting resurrection
'87 GN w/16.8K
"96 Bronco XLT w/351 (5.8l)

Pete D Offline
Sharp turns (donuts) with less than about 1/2 tank is going to result in fuel starvation with sputter and missing. Run the fuel system diagnostics:
Pete Dunham


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