You need to measure the resistance of the glow plugs...

If the resistance gets high, the power and heat the combustion chamber sees is greatly reduced.

Since your plugs are new, you should be 0.6-0.7 ohms @70F measured from the glowplug relay harness.


Michael

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E