P158b Renault -
A smoke machine is invaluable. Introduce smoke into the intake tract or vacuum system. Any escaping smoke pinpoints a leak that no visual check may catch.
| Feature | Specification | |----------------------|---------------------------------------| | Engine | 1.1 L (1108 cc) Cléon-Fonte I4 | | Power | 34 hp (DIN) – 45 hp (export version) | | Transmission | 4-speed manual, floor shift (LHD) | | Layout | Front-engine, front-wheel drive | | Suspension | Independent torsion bars (all-round) | | Top speed | ~120 km/h (75 mph) | | Fuel economy | ~6.5 L/100 km (36 mpg US) | | Notable features | Rectangular lights, full dashboard | p158b renault
While driving (or on a dyno), graph:
If actual boost consistently stays below requested under load → Underboost issue (vacuum leak, stuck vanes, boost leak).
If actual boost overshoots requested → Overboost issue (stuck vanes in low position, faulty solenoid). A smoke machine is invaluable
