I thought I was special, but it looks like I need injectors.... - ZR-1 Net Registry Forums

bowtiguy · 10-25-2018

I finally took the plunge on my first C4Z earlier this fall. I brought home #1631, a 1991' Dark Red Metallic/Black interior. Now we have two in the family ( my parents have a 91' Quasar/blue car w/ 19K on the clock).

I wasn't "looking" for a C4Z but have found memories of these cars as I graduated HS in 89'. But I have to say, the Dark Red Metallic is growing on me and it pulls to 7K better than my C6Z did. This was a one family car w/ 9,600 miles. Its spent its entire life here in Colorado.

Prior to purchase, the previous owner had the original selling dealer, "Purifoy Chevrolet" in Fort Lupton, replace both fuel pump assemblies and a bad oil cooler line. Other than that, this car is BONE STOCK even down to its period correct gatorbacks (still has the TPS sensor stickers on the outer rim lips).

Service procedures completed so far

-full oil change including draining the oil cooler/filter
-ZF transmission fluid change
-tighten ALL oil pan gaskets
-replaced power steering fluid
-cleaned coolant overflow tank/topped off.

After securing a set of original ZR-1 A-Molds from my father and getting new PS2's mounted, I've noticed the higher RPM cut out signifying fuel starvation. No vac leaks and secondaries are definitely working.

Combine this with the loss of factory paint on the passenger side plenum & cam cover after the oil line fiasco and it looks like I'm pulling the plenum...

Considering the cars low miles, I'm looking for any recommendations on what to do "while I'm in there" .... before I lite up the CC at Jerrys and Marc's.

After doing a bit of searching and attempting to keep the car as stock as possible in case I decide to go for NCRS or sell it in the future, I've come up with the following list.

- pull plenum/TB/injector housings ( strip & paint these pieces)
- replace ALL top end gaskets
- inspect gas tank( work done by the dealer)
- install new fuel filter
- replace all 16 injectors/gaskets
- replace spark plugs
- TB coolant bypass pipe (vs. plugs)
- test factory coils
- test secondary vac system.
- clean out the engine valley after the residents were evicted
- flush coolant system/install new thermostat
- flush brake all brake fluid
- change rear diff fluid
- stage 1 prom swap from Marc H.
- Bolt on my Borla Cat back.
- drive it!!!

Items on the fence about..

-starter/solenoid
-coil replacement

Any suggestions “while I’m in there”?

10-25-2018	#1
bowtiguy Join Date: Aug 2005 Location: Cali-rodo Posts: 270	“While I’m in there”.....another plenum pull. I finally took the plunge on my first C4Z earlier this fall. I brought home #1631, a 1991' Dark Red Metallic/Black interior. Now we have two in the family ( my parents have a 91' Quasar/blue car w/ 19K on the clock). I wasn't "looking" for a C4Z but have found memories of these cars as I graduated HS in 89'. But I have to say, the Dark Red Metallic is growing on me and it pulls to 7K better than my C6Z did. This was a one family car w/ 9,600 miles. Its spent its entire life here in Colorado. Prior to purchase, the previous owner had the original selling dealer, "Purifoy Chevrolet" in Fort Lupton, replace both fuel pump assemblies and a bad oil cooler line. Other than that, this car is BONE STOCK even down to its period correct gatorbacks (still has the TPS sensor stickers on the outer rim lips). Service procedures completed so far -full oil change including draining the oil cooler/filter -ZF transmission fluid change -tighten ALL oil pan gaskets -replaced power steering fluid -cleaned coolant overflow tank/topped off. After securing a set of original ZR-1 A-Molds from my father and getting new PS2's mounted, I've noticed the higher RPM cut out signifying fuel starvation. No vac leaks and secondaries are definitely working. Combine this with the loss of factory paint on the passenger side plenum & cam cover after the oil line fiasco and it looks like I'm pulling the plenum... Considering the cars low miles, I'm looking for any recommendations on what to do "while I'm in there" .... before I lite up the CC at Jerrys and Marc's. After doing a bit of searching and attempting to keep the car as stock as possible in case I decide to go for NCRS or sell it in the future, I've come up with the following list. - pull plenum/TB/injector housings ( strip & paint these pieces) - replace ALL top end gaskets - inspect gas tank( work done by the dealer) - install new fuel filter - replace all 16 injectors/gaskets - replace spark plugs - TB coolant bypass pipe (vs. plugs) - test factory coils - test secondary vac system. - clean out the engine valley after the residents were evicted - flush coolant system/install new thermostat - flush brake all brake fluid - change rear diff fluid - stage 1 prom swap from Marc H. - Bolt on my Borla Cat back. - drive it!!! Items on the fence about.. -starter/solenoid -coil replacement Any suggestions “while I’m in there”? Last edited by bowtiguy; 01-20-2024 at 10:46 AM.