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jerking, popping, cutting out


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#1 TexasQuest

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Posted 23 May 2018 - 04:28 PM

I was driving my car today, 90 degree plus temp outside. Anyway driving it a little spiritedly it started bucking, popping and ultimately the engine died. Happened to me a couple of times before I got it home. I noticed the tachometer was barely bouncing when I was cranking it leading me to believe a possible ignitor issue. Also the fuel pump has never been changed since I've had it 10+ years so it could possibly be overheating & failing. It's got new injector clips and the injectors seem fine. No vacuum leaks or boost leaks that I can see anywhere. It kinda sounds like a fuel issue to me but possibly ignition/timing?
88 Fiji Blue -Tsi
Zoom clutch, Fidanza flywheel, Stedebani shifter, KSport coilovers, ST swaybars, abs delete, a/c delete, cruise delete, JVE, BSEK, TEP steel brake lines, LSP braided cooler lines, CX Racing radiator,  MK1 silicone hoses, MK1 pullies, *DM hard pipes & intercooler,14G turbo, ported exh. manifold, MAF Translator, 3.5" GM maf, Turbo XS RFL bov, *DM 3" exhaust, Cusco front strut bar, TEP rear strut bar, Enkei 92's, HKS turbo timer, AEM wideband, AEM boost gauge, AEM oil pressure gauge, Hallman boost controller
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.





#2 87redcat

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Posted 23 May 2018 - 05:12 PM

You could test the pump with the test plug thats buried behind the pass headlight. Pretty sure the fsm has a procedure for it.

How about fuel filters? Is the pump original? If so the cone filter on the inlet side of the pump is probably clogged
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#3 croquest87

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Posted 23 May 2018 - 05:15 PM

I would start with good fuel pressure check at idle  and if that's good the rev it real hard see if the pressure is dropping it should not drop.

#4 scott87star

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Posted 23 May 2018 - 06:49 PM

Coils like to fail when hot, then work again once cooled off.  But it could be fuel related as well, fuel pumps can start to cavitate when the fuel gets hot.
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#5 Gregster1234

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Posted 23 May 2018 - 08:26 PM

Mine did this and it turned out to be fuel restriction .It had the original cone filter right before the fuel pump in the hose .i replace the pump and added a new inline filter. It wound up also blowing the head gasket from the bucking!

#6 TexasQuest

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Posted 23 May 2018 - 10:06 PM

I'm gonna put a fuel gauge on the mixer housing and see what pressures I've got and go from there. Thanks guys.
88 Fiji Blue -Tsi
Zoom clutch, Fidanza flywheel, Stedebani shifter, KSport coilovers, ST swaybars, abs delete, a/c delete, cruise delete, JVE, BSEK, TEP steel brake lines, LSP braided cooler lines, CX Racing radiator,  MK1 silicone hoses, MK1 pullies, *DM hard pipes & intercooler,14G turbo, ported exh. manifold, MAF Translator, 3.5" GM maf, Turbo XS RFL bov, *DM 3" exhaust, Cusco front strut bar, TEP rear strut bar, Enkei 92's, HKS turbo timer, AEM wideband, AEM boost gauge, AEM oil pressure gauge, Hallman boost controller
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

#7 Matt888

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Posted 13 June 2018 - 05:42 PM

Iíll be tracking this thread, as I experienced a similar situation this week with my 86.  Seemed to be fine running around on short trips but went to take it on a 30min commute this week and it started deteriorating the last 10min on the way into work and way home....  as if you could start your watch and know that approximately 20min into a drive it will bog, idle will go south, and youíll be just about stranded.  Warm summer week in Florida.  Will start with inspecting the in tank filter, followed by adding a temp fuel pressure gauge and watching the results when it takes place.

#8 TexasQuest

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Posted 13 June 2018 - 06:18 PM

Yes it is in fact the fuel pump. I installed a fuel gauge on the tbi fuel rail and it shows no more than 20 psi at idle and giving it throttle as well. Now it will idle for about 15 seconds after cranking it cold and then the motor will die. It will not start if I try to crank it immediately afterwards. Time for a 255 lph. B)
88 Fiji Blue -Tsi
Zoom clutch, Fidanza flywheel, Stedebani shifter, KSport coilovers, ST swaybars, abs delete, a/c delete, cruise delete, JVE, BSEK, TEP steel brake lines, LSP braided cooler lines, CX Racing radiator,  MK1 silicone hoses, MK1 pullies, *DM hard pipes & intercooler,14G turbo, ported exh. manifold, MAF Translator, 3.5" GM maf, Turbo XS RFL bov, *DM 3" exhaust, Cusco front strut bar, TEP rear strut bar, Enkei 92's, HKS turbo timer, AEM wideband, AEM boost gauge, AEM oil pressure gauge, Hallman boost controller
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.

#9 techboy

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Posted 13 June 2018 - 10:46 PM

Glad you figured it out so quick. I think fp is supposed to be 38 lbs (right?) So it's definitely way low.
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#10 tux

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Posted 14 June 2018 - 08:45 AM

35.6 psi / 245 kPa

#11 croquest87

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Posted 14 June 2018 - 09:01 AM

New pump along with some new filters clean out the system you're good to go. Just keep in mind your fuel pressure regulator can also be a suspect I would swap that sucker w new one or adjustable one.

Edited by croquest87, 14 June 2018 - 09:12 AM.


#12 TexasQuest

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Posted 14 June 2018 - 05:06 PM

Yep that is the plan croquest.
88 Fiji Blue -Tsi
Zoom clutch, Fidanza flywheel, Stedebani shifter, KSport coilovers, ST swaybars, abs delete, a/c delete, cruise delete, JVE, BSEK, TEP steel brake lines, LSP braided cooler lines, CX Racing radiator,  MK1 silicone hoses, MK1 pullies, *DM hard pipes & intercooler,14G turbo, ported exh. manifold, MAF Translator, 3.5" GM maf, Turbo XS RFL bov, *DM 3" exhaust, Cusco front strut bar, TEP rear strut bar, Enkei 92's, HKS turbo timer, AEM wideband, AEM boost gauge, AEM oil pressure gauge, Hallman boost controller
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View PostJohnnyWadd, on 04 March 2010 - 10:01 PM, said:

my shaft was big i dont know what your talking about.




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