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ST 185 jolting


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#1 romuk85

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Posted 04 August 2015 - 10:57 PM

ST 185 jolting.  So i accelerate  to 70km in second gear every thing is fine until i ease off and try and hold 70km

still in second gear the car starts jolting real bad if i let off the gas or accelerate the car is fine again. Its just when i try and hold high revs. 

 

Spark plugs are new 

engine is standard 

no boost control 



#2 rev_head

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Posted 04 August 2015 - 11:34 PM

Kinda hard to go off. Could be a large number of things.
going off what you have said tho. Thw fact you said jolting rather then saying a miss id be looking for an air leak
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#3 st182er

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Posted 05 August 2015 - 10:52 AM

do you have a BOV?


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#4 romuk85

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Posted 05 August 2015 - 12:30 PM

no . But don't know the cars history so there could have been and then taken out 



#5 Fodder

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Posted 05 August 2015 - 04:43 PM

I was going to say, sounds kinda like compressor surge but hard to say - I get it if I accelerate hard then ease off (but not right off) sometimes.


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- 1990 JDM ST185 - TEIN HAs / CUSTOM DMS SPRINGS - WHITELINE REAR SWAYBAR - WHITELINE REAR STRUT BRACE - CT20B TURBO - 3" AUSSIE EXHAUST / DUMP PIPE - CHINA SPEC FMIC - NPC CLUTCH / LIGHTWEIGHT FLYWHEEL - GROUP A FRONT BAR - CUSTOM PEELING CLEARCOAT - 18" OX631 RIMS - TURBOTECH MANUAL BOOST CONTROLLER (@15PSI) -


#6 romuk85

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Posted 05 August 2015 - 09:55 PM

I have no problem while I rev the car in neutral
If I had surge problems would that be noticeable in neutral

#7 romuk85

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Posted 05 August 2015 - 09:56 PM

Would a bov help

#8 st182er

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Posted 06 August 2015 - 07:50 PM

not really. it, would probably make it worse, unless it is recirculated properly

 

I was having a similar issue but only when I was pushing it through the gears, the BOV was venting the air straight into the atmosphere and the ECU couldn't detect the loss of O2 so it ran rich for a split second causing the engine to choke a little in-between gears, 

 

now I have it recirculated it runs perfectly.


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#9 romuk85

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Posted 06 August 2015 - 10:44 PM

I changed the ecu today because i have a spare one and seemed to fix about 95% of the problem but only for 5 minutes 



#10 ROME

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Posted 16 November 2015 - 11:15 AM

To me, this sounds like a Mass Air Flow Meter issue.

It's easy to pull out and check.

Make sure the paddle moves freely with no sticky points.

You can youtube how to clean them.

Also if you have the big green book you can check the points with a malty meter. 

Good luck.



#11 silycr

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Posted 16 November 2015 - 05:23 PM

Have you checked the engine codes? even though there isn't a light on, it may have grabbed something to work with.

 

ROME could be right. I've had a similar problem with a loose AFM connection. But this also affected accelerating though






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