Engine/Transmission (1994 - 1998) Possible ddp4 problem

[Shell 96]

I installed my ddp4s. easy install took my time extra clean yada yada yada, i idled my injectors for a while everything seemed good, took it for a test ride 1mile total. got on it awesome came back parked checked for leaks while still running, no leaks good, well i was staring at my engine and it would shake a lil every so often in a definate pattern like a slightly loose line for like a two secs and then back to normal. so i checked all rpms and its the worst between 1000-1250 rpm it seems to wave in and out its fine from 1250 up what gives



TIA

Casey

 

[Shell 96]

ive been thinking, ddps are supposed to be a little more touchy right? so what if the problem is my 4kgsk i installed at the same time as my old low quality injectors?

 

[Vaughn MacKenzie]

Welcome to the modified 12-valve life, going bigger injectors with a GSK can cause what you are seeing especially with the 4K kit. It's not uncommon for P-pump 12-valves to have a slight low-RPM, low-load miss. Need to make sure the GSK springs are perfectly balanced on both sides, using a vernier caliper. I doubt the injectors are the problem.

 

[Shell 96]

i will re-do the gsk today, also problem only occurs when its warm once it hits 140 or so it starts.



Casey

 

[Vaughn MacKenzie]

. . . also problem only occurs when its warm once it hits 140 or so it starts.



Casey

That's pretty typical.

 

[Shell 96]

Re-did Gsk, fixed the problem



Thank you!

Casey