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An insect growth regulator (IGR) is a substance (chemical) that inhibits the life cycle of an insect. IGRs are typically used to control populations of harmful pests, such as cockroaches or fleas.dvantages [edit]. Many IGRs are labeled reduced risk by the Environmental Protection Agency, meaning that they target juvenile harmful insect populations while causing less detrimental effects to beneficial insects.
- Possible engine hesitation. P0400 Description. Early Exhaust Gas Recirculation (EGR) systems component s include and EGR Valve, and Engine Control Îodule (ECÎ¼) Controlled Vacuum Switch Valve or EGR Solenoid and an EGR Vacuum Îodulator.