ZR-1 Net Registry Forums - View Single Post - Knowledgeable Tech -Starting/Performance problem needing assistance

A26B · 04-27-2011

While I do agree completely with Z51Jeff, regarding the need to ultimately replace original injectors, especially for 90~92 models, I would also suggest the following posibility that can be easily checked & remedied if necessary.

One of the more common ocurrences is a MAP sensor hose that has come loose. The LT5 with its waste spark system, requires that during starting, the key is held in the start position momentarily after the engine starts. Otherwise, on ocassion, the engine will backfire and the suden manifold pressure will blow the connector hose (plenum to MAP sensor) off.

Here is a photo showing the placement of the MAP Sensor hose.

04-27-2011	#3
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,401	Re: Knowledgeable Tech -Starting/Performance problem needing assistance While I do agree completely with Z51Jeff, regarding the need to ultimately replace original injectors, especially for 90~92 models, I would also suggest the following posibility that can be easily checked & remedied if necessary. One of the more common ocurrences is a MAP sensor hose that has come loose. The LT5 with its waste spark system, requires that during starting, the key is held in the start position momentarily after the engine starts. Otherwise, on ocassion, the engine will backfire and the suden manifold pressure will blow the connector hose (plenum to MAP sensor) off. Here is a photo showing the placement of the MAP Sensor hose. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.