91 ZR-1 Cutting Out Under Load - ZR-1 Net Registry Forums

GregCrowe · 03-16-2009

Jeff, is there anything special about the ZR1 coils? Are all these GM DIS coils the same?

edit: I'm finding that most all GM cars with DIS systems use the AC Delco D555 coil. For some reason, the ZR1 is listed as using the D545 which seems to be ZR1 specific. This has me suspecting the Summit Coils or any other standard coils may be a problem ??? But then again, just found another webpage with a GM replacement coil(Chinese like all the cheapies at Auto Zone and OReillys) saying it replaces BOTH the D555 and D545. I'm confused.

http://www.rmsautoparts.com/proddetail.php?prod=D545

http://www2.partstrain.com/store/?Nt...586&SID=1&cj=1

http://www.amazon.com/gp/product/B00...=A8F3HAQ1FDLH8

Further investigation finds the Accel coil:

Summit coil as shown on Summits website:

Summit coils they sent me:

Notice how the coils Summit sent me don't match the pic on their website. Also notice that the Summit coils sent to me are exact copies of the Accel coils. The body is the exact same and these are the only versions that look like this. They also both have the gold terminals and both have the little side tabs that have to be ground off. Jeff, aren't you using the Accel coils? I'm 99% positive the Accels and Summits sent to me are the same thing.

Further edit: Sherlock Holmes scores........

BUSTED ! For sure the Summit coils sent to me ARE ACCEL COILS !
Notice the part number on the side of the Summit boxes: SUM-850017
Part number listed for the Accel coils : ACC-140017 http://www.accel-ignition.com/Produc...minselection=1

03-16-2009	#18
GregCrowe Join Date: Sep 2004 Location: Oklahoma Posts: 111	Re: 91 ZR-1 Cutting Out Under Load Jeff, is there anything special about the ZR1 coils? Are all these GM DIS coils the same? edit: I'm finding that most all GM cars with DIS systems use the AC Delco D555 coil. For some reason, the ZR1 is listed as using the D545 which seems to be ZR1 specific. This has me suspecting the Summit Coils or any other standard coils may be a problem ??? But then again, just found another webpage with a GM replacement coil(Chinese like all the cheapies at Auto Zone and OReillys) saying it replaces BOTH the D555 and D545. I'm confused. http://www.rmsautoparts.com/proddetail.php?prod=D545 http://www2.partstrain.com/store/?Nt...586&SID=1&cj=1 http://www.amazon.com/gp/product/B00...=A8F3HAQ1FDLH8 Further investigation finds the Accel coil: Summit coil as shown on Summits website: Summit coils they sent me: Notice how the coils Summit sent me don't match the pic on their website. Also notice that the Summit coils sent to me are exact copies of the Accel coils. The body is the exact same and these are the only versions that look like this. They also both have the gold terminals and both have the little side tabs that have to be ground off. Jeff, aren't you using the Accel coils? I'm 99% positive the Accels and Summits sent to me are the same thing. Further edit: Sherlock Holmes scores........ BUSTED ! For sure the Summit coils sent to me ARE ACCEL COILS ! Notice the part number on the side of the Summit boxes: SUM-850017 Part number listed for the Accel coils : ACC-140017 http://www.accel-ignition.com/Produc...minselection=1 Last edited by GregCrowe; 03-17-2009 at 06:11 AM.