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ZR1NET  April 2018

ZR1NET April 2018

Subject:

Re: TECH: surging while warming up

From:

"J.K. DeBuhr" <[log in to unmask]>

Reply-To:

J.K. DeBuhr

Date:

Mon, 30 Apr 2018 14:45:23 -0500

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (128 lines)

Marc,

I will send you what I have tonight. they are on my home PC

Jeff

On Mon, Apr 30, 2018 at 2:43 PM, Marc Randolph <[log in to unmask]> wrote:

> Thanks Jeff.  I see you previously posted the config files to
> http://www.gearhead-efi.com/Fuel-Injection/showthread.php?
> 375-1228331-ECM-Information-8EA&p=2675#post2675
> Are those the latest?
>
> I have a 91, but as you said back in 2013, there is little difference
> between the two.
> Just for grins, I might see if I can fire up my old Diacom "laptop".
>
> For the others that are suggesting a vacuum leak, I suppose it's
> possible, but it isn't a normal one.  The car idles just fine...
> purring along at ~675 rpm, even with Jeal EA22 cams.
> And yep Hib - these are the original O2 sensors, so that's a suspect.
> Just passed 60k miles.
>
>       Marc
>
> On Mon, Apr 30, 2018 at 2:20 PM, J.K. DeBuhr <[log in to unmask]> wrote:
> > I suggest TunerPro for the PC and ALDLDroid for Android. they both use
> the
> > same configuration files. Then to connect to the car I use a bluetooth
> > adapter from http://www.1320electronics.com/
> >
> > I also have a USB Cable I made for direct cable connection. I have all
> the
> > ADX files for the LT5s for all model years. it works great for what you
> are
> > looking for
> >
> > Jeff
> > 1990 #1051
> >
> > On Mon, Apr 30, 2018 at 1:14 PM, Marc Randolph <[log in to unmask]> wrote:
> >>
> >> Howdy all,
> >>
> >> I'll start with my questions, then provide the back-story:
> >>
> >> 1. What are people using as a modern Diacom replacement?  modern PC or
> >> Android preferred.  Real-time graphing capability would nice, but the
> >> main point is logging, possibly graphing it later.
> >>
> >>
> >> 2. Any ideas on what might cause a surging problem that goes away
> >> AFTER the ignition is cycled when the car is fully warmed up?
> >>
> >>
> >> With my daughter now of driving age, I've loaned my daily driver to
> >> her and have started driving the ZR-1 every day.  And yes, she's asked
> >> multiple times if she can drive it to school (or anywhere) by herself
> >> - looks like I've created a monster by making her learn to drive a
> >> stick!
> >>
> >> Anyway, 2 months ago it started driving worse.  I found several
> >> injectors were bad, so I replaced them all.  That mostly fixed the
> >> problem, but I had introduced two new ones.  I pulled the plenum again
> >> and found where (on the previous pull) I had broken a brittle vacuum
> >> hose and somehow loosened a plug wire from its coil.  So fixed all
> >> that and now it ran good.  Ended up replacing spark plugs also.
> >>
> >> So... new plugs and new primary injectors and it runs like a top for a
> >> month or two.  Last week, in the middle of the drive to work, it
> >> started mildly surging.  During light throttle (to maintain speed...
> >> RPM's in the 1500 to 2000 range), it would feel like it's losing
> >> power, than suddenly it's not, then losing, then not.  At a stop, the
> >> idle sometimes (but not always) wanders from the normal 675 RPM up to
> >> 1000 RPM - and sometimes as high as 1200 RPM.   It seems to get worse
> >> as the car is warming up, so I'm imagining all kinds of things.  I
> >> pull over and turn the car off - don't see or smell anything weird.
> >> So I fire it back up, and .... the problems are gone.
> >>
> >> I've repeated this several times now and it's pretty consistent - when
> >> the problem starts occurring, I can cycle the ignition and the problem
> >> goes away... ASSUMING the car has been running long enough. And once
> >> it's gone, it stays gone until it cools way down.  Not sure what the
> >> threshold is yet (hence the need for a Diacom-like software).
> >>
> >> Good ol'dad suggested he's had a similar behavior on a different car
> >> with a bad temperature sensor.  But those seem to be functioning
> >> properly.  I do wonder about the O2 sensors though...
> >>
> >> Idle speculation welcome!
> >>
> >>       Marc
> >>
> >> TOPICS: TECH or SALOON
> >> Problems? Contact ZR1Mom at: [log in to unmask]
> >> ZR-1 Store @ http://www.zr1net.net
> >> ZR-1 Saloon Keeper
> >
> >
> >
> >
> > --
> >
> > “A man who has once gotten automobiles into his blood can never give them
> > up. . .”
> >
> > Preston Tucker
>
> TOPICS: TECH or SALOON
> Problems? Contact ZR1Mom at: [log in to unmask]
> ZR-1 Store @ http://www.zr1net.net
> ZR-1 Saloon Keeper
>



-- 

*“A man who has once **gotten automobiles into **his blood can never **give
them up. . .”*

Preston Tucker

TOPICS: TECH or SALOON
Problems? Contact ZR1Mom at: [log in to unmask]
ZR-1 Store @ http://www.zr1net.net
ZR-1 Saloon Keeper

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