surging when slowing down?

552 Views 7 Replies 3 Participants Last post by 1fastcavi, Sep 20, 2007

1fastcavi

Discussion Starter · Sep 16, 2007

94 z clone 3.1 5 speed

let me start with what iv done
changed the throttle body with new iac, tps., changed o2 sencer, changed the intake temp sencer, plugs and wires are new.

now the problem

between 15 and 25 or 30 when you let off the gas in ANY GEAR it will give you whiplash. it bucks and surges and goes to hell. at stedy throttle it surges as if you were in a high gear at extremly low rpms. but the engin seems to sound smooth, just the fact of it going up and down about 300 rpm or so. and at any higher speed from say 40 do 75 or so when you let off in 5th or 4th it does the same, just not as violent.

im going to change the fuel filter to see if it changes anything, after that im lost. you guys have any ideas?

and BTW i checked for a vac leak. no vac leak found

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1fastcavi

Discussion Starter · #2 · Sep 17, 2007

bump.. btw new cat, muffler, and airfilter

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tfdengine58

· #3 · Sep 18, 2007

my car is doing something much similar... my suspicion is FPR or fuel pump... either that or something with your coil packs... im going to replace both tomorrow so ill let you know if it fixes my problem, might help you narrow yours down!

Dave

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1fastcavi

Discussion Starter · #4 · Sep 18, 2007

im changing coilpacks and icm tommorrow. relocating the coilpacks to the Cruse Controle bracket. so we will see if thats it..

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1fastcavi

Discussion Starter · #5 · Sep 20, 2007

well i put my coils behind my battery. new icm and coils and it seems to have got rid of the surging, theres still a hint of it there. but other then the normal 5 speed jurk when slowing down its cleared it up

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barrok69

· #6 · Sep 20, 2007

1fastcavi said:
well i put my coils behind my battery. new icm and coils and it seems to have got rid of the surging, theres still a hint of it there. but other then the normal 5 speed jurk when slowing down its cleared it up

Did you do a idle relearn after you replaced the icm/coils?... you should.

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1fastcavi

Discussion Starter · #7 · Sep 20, 2007

yep, idle relearn was the first think i done. i will be able to tell you better of how its going to do this evening, but for now. it fixed it.

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1fastcavi

Discussion Starter · #8 · Sep 20, 2007

welp shes fixed, theres the normal 5 speed jump here and there, but no more surging and going to hell :lol: :lol: im fucking glad this fixed my problem!!!!

so the very few people using the search button on the future, surging when slowing down CAN be caused by shitty icm/coils.

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